{"id":79529,"date":"2022-08-16T09:59:20","date_gmt":"2022-08-16T16:59:20","guid":{"rendered":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/?p=79529"},"modified":"2022-08-16T09:59:20","modified_gmt":"2022-08-16T16:59:20","slug":"2003-silverado-5-3l-3rd-gen-ls1-code-p0300","status":"publish","type":"post","link":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2022\/08\/2003-silverado-5-3l-3rd-gen-ls1-code-p0300","title":{"rendered":"2003 Silverado 5.3L 3rd gen. LS1 Code P0300"},"content":{"rendered":"\n<p>I accidentally drove my <a href=\"https:\/\/www.chevrolet.com\/trucks\">Chevy truck<\/a> in low 3rd gear at 65 mph for about 8 min. or 5 miles. The truck slowly bogged down and I limped back home. Since then, I cannot seem to get things back to normal. Before this happened, I had everything running great. It seems like a fuel problem. I can start the engine but it idles very rough and I can get it up to 3000rpm but after about 30sec, It looses power and decelerates. Had several DTC codes but the one I cannot get rid of is PO300 (random misfire) and even though I replaced the MAF, I still get an occasional PO101 code. I replaced the MAP, MAF and since It has 185000mi, I also replaced the oil pump, timing chain and water pump. I still have same symptoms. And I have reset the computer and cleaned the throttle body. I have not attempted to do anything to the throttle control yet. I have 62psi fuel pressure at the rail and I have tested the fuel regulator and checked for air intake leaks. Can you help? would the transmission solenoids make it run badly in idle? Since I drove it the way I did, I was looking for mechanical problems but I see none.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>First thought, intake gasket. <\/p>\n\n\n\n<p>Though the cause of the problem may or may not be the intake manifold gasket I still am leaning toward a vacuum leak of some kind. Since you have a <a href=\"https:\/\/www.freeautomechanic.com\/engine-misfire.html\">p0300 misfire code<\/a> it also falls in that category. But lets get you the technical information so we don&#8217;t leave anything. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-chevy-code-p0300\">Chevy Code P0300 <\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2022\/08\/2003-chevy-silverado-1500-code-p0300-1.gif\"><img decoding=\"async\" width=\"2374\" height=\"2990\" src=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2022\/08\/2003-chevy-silverado-1500-code-p0300-1.gif\" alt=\"\" class=\"wp-image-79575\"\/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2022\/08\/2003-chevy-silverado-1500-code-p0300-2.gif\"><img decoding=\"async\" width=\"2402\" height=\"2990\" src=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2022\/08\/2003-chevy-silverado-1500-code-p0300-2.gif\" alt=\"\" class=\"wp-image-79576\"\/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2022\/08\/2003-chevy-silverado-1500-code-p0300-3.gif\"><img decoding=\"async\" width=\"2499\" height=\"2990\" src=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2022\/08\/2003-chevy-silverado-1500-code-p0300-3.gif\" alt=\"\" class=\"wp-image-79577\"\/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2022\/08\/2003-chevy-silverado-1500-code-p0300-4.gif\"><img decoding=\"async\" width=\"2990\" height=\"1434\" src=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2022\/08\/2003-chevy-silverado-1500-code-p0300-4.gif\" alt=\"\" class=\"wp-image-79578\"\/><\/a><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>I accidentally drove my Chevy truck in low 3rd gear at 65 mph for about 8 min. or 5 miles. The truck slowly bogged down and I limped back home. Since then, I cannot seem to get things back to normal. Before this happened, I had everything running great. It seems like a fuel problem.&hellip;&nbsp;<a href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2022\/08\/2003-silverado-5-3l-3rd-gen-ls1-code-p0300\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">2003 Silverado 5.3L 3rd gen. LS1 Code P0300<\/span><\/a><\/p>\n","protected":false},"author":17359,"featured_media":33418,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[1,3],"tags":[],"class_list":["post-79529","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-auto-repair-questions","category-chevy"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.0 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>2003 Silverado 5.3L 3rd gen. LS1 Code P0300 - FreeAutoMechanic Advice<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2022\/08\/2003-silverado-5-3l-3rd-gen-ls1-code-p0300\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2003 Silverado 5.3L 3rd gen. LS1 Code P0300\" \/>\n<meta property=\"og:description\" content=\"I accidentally drove my Chevy truck in low 3rd gear at 65 mph for about 8 min. or 5 miles. The truck slowly bogged down and I limped back home. Since then, I cannot seem to get things back to normal. Before this happened, I had everything running great. It seems like a fuel problem.&hellip;&nbsp;Read More &raquo;2003 Silverado 5.3L 3rd gen. LS1 Code P0300\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2022\/08\/2003-silverado-5-3l-3rd-gen-ls1-code-p0300\" \/>\n<meta property=\"og:site_name\" content=\"FreeAutoMechanic Advice\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/freeautomechanic\" \/>\n<meta property=\"article:published_time\" content=\"2022-08-16T16:59:20+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2022\/08\/2003-chevy-silverado-1500-code-p0300-1.gif\" \/>\n<meta name=\"author\" content=\"russvato25\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"russvato25\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"2003 Silverado 5.3L 3rd gen. LS1 Code P0300 - FreeAutoMechanic Advice","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2022\/08\/2003-silverado-5-3l-3rd-gen-ls1-code-p0300","og_locale":"en_US","og_type":"article","og_title":"2003 Silverado 5.3L 3rd gen. LS1 Code P0300","og_description":"I accidentally drove my Chevy truck in low 3rd gear at 65 mph for about 8 min. or 5 miles. The truck slowly bogged down and I limped back home. Since then, I cannot seem to get things back to normal. Before this happened, I had everything running great. It seems like a fuel problem.&hellip;&nbsp;Read More &raquo;2003 Silverado 5.3L 3rd gen. LS1 Code P0300","og_url":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2022\/08\/2003-silverado-5-3l-3rd-gen-ls1-code-p0300","og_site_name":"FreeAutoMechanic Advice","article_publisher":"https:\/\/www.facebook.com\/freeautomechanic","article_published_time":"2022-08-16T16:59:20+00:00","og_image":[{"url":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2022\/08\/2003-chevy-silverado-1500-code-p0300-1.gif","type":"","width":"","height":""}],"author":"russvato25","twitter_card":"summary_large_image","twitter_misc":{"Written by":"russvato25","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2022\/08\/2003-silverado-5-3l-3rd-gen-ls1-code-p0300#article","isPartOf":{"@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2022\/08\/2003-silverado-5-3l-3rd-gen-ls1-code-p0300"},"author":{"name":"russvato25","@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/#\/schema\/person\/310f928b211d10cc8174d7945c19f8aa"},"headline":"2003 Silverado 5.3L 3rd gen. 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