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High idle, misfire, check engine light,High idle, misfire, check engine light,
The Idle Air Control valve is located on the side of the throttle plate. Normally the only problem they have is getting gummed up and need a good cleaning.
if its only on idle it sounds like a bad injector
choke idle adjustment on 1988 Buick Riviera
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The engine will have low compression and misfire, especially at idle. The misfire will seem to disappear at higher RPM.
I HAVE THE SAME VEHICLE AND HAD THE SAME PROBLEM... THERE IS A SERVICE BULLETIN FOR THE IDLE AIR CONTROL VALVE. THAT SOLVED MY INTERMITANT HIGH IDLE.
Normally a vacuum leak.
yes it can
If your 1997 GMC 5.7L Vortec has a misfire at an idle but not while under throttle, the problem is likely the timing. This can be adjusted.
Check idle adjustment (rpm) then check timing, then check for misfire-start there.
Probably a misfire, it could be in need of a tune up.