Idles really high 95 GMC Sierra 1500 350 5.7l v8

1995 GMC Sierra

Replaced the IAC and now it idles really high with out dropping. I 22000000

High Idle is a classic description of a vacuum leak. If the idle was fine before you worked on it, start by rechecking your work. Often a vacuum leak is accompanied by a slight whistling noise. Check the obvious vacuum hoses. Look at the hose going to the brake booster and the PCV valve. With the engine running sometimes you can just wiggle those hoses and notice a difference.

1 thought on “Idles really high 95 GMC Sierra 1500 350 5.7l v8”

  1. Thanks for the tip. I figured it out, had to push in the spring a bit on new IAC… Runs good now!

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