Engine Performance problem
1996 Chevy Lumina 6 cyl Front Wheel Drive Automatic 224500 miles
I just did an upper rebuild on a '96 Lumina that had blown head gaskets. Got the car cheap, and previous owner never said it ran rough when idling. After rebuild, car runs great on highway but when you come to a stop or have it at idle for extended period of time, it kicks to a low idle, and then it seems to kick to a very low idle. Check engine light comes on and code reads " Multiple Cylinder Misfire". Wondering if this might be the problem of just teh idle screw needing to be tweaked a bit or if there might be a bigger problem.
Check for any vacuum leaks or cracks in any hoses. Those idle screws are factory set. Your not really supposed to touch those but some people automatically think carbeurator idle when they see one of those and want to start turning it. And maybe they screwed with it before you even got it, so thats a funny subject. Your idle air control valve should be ohm tested for faultiness. And throttle body should have a thorough cleaning too. Check back with results. Oh have it scanned if you can for any codes (autozone does it for free)