02 gmc. 4.3l problems returning to idle
Truck starts and runs great. Idles great. But if u rev
it when u let off gas and It returns to idle it drops
down and wants to stall. Some times it shutters
and picks back up to idle. Sometimes it stalls.
Always cranks right back up and runs
Make sure the throttle body is clean, if that doesn't help then it could be the ISC motor is slow in responding and may need replaced. If it is one I think it is it's not cheap.
Try cleaning the Mass Air Flow Sensor that is in the intake tube running to the throttle body with electrical cleaner.
Just don't put carb clean on the MAF sensor lol, it will destroy it. They make a MAF cleaner.
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