i changed the spark plugs and wires and ignition coils and ignition wire . the car was running fine till i replaced these items now it is misfiring and idling erratic . what can i so ? ob2 scanner says random misfire on 1 and 3 cylinders .
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Swap the #1 and #3 wire and this should take care of it. You crossed one on installation. Only other thing it could be would be a bad part or pinched spark plug gap.