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I had the same problem and it turned out to be the fuel purge censor
maybe the clutch
Why does my 2000 Pontiac Grand Am, with a 2.4L engine, run rough at idle but runs normally when placed in neutral? I changed the plugs and air filter, but the problem continues.
Mine was doing that for a while. I took the Idle Air Control valve apart and cleaned it. Problem solved. Its normal for the engine to idle higher when its cold though. Once it warms up a bit the idle should settle down.
check coolant level
Hi I had this problem. make sure your water level in the radiator is full,because there is a sensor kelvin
A vacuum leak (Brake booster).
plugs or vacuum. 65;
the engine to stall and surge at idle
auto or stick shift
most common problem causing a surge while a car idles is the MAF-Mass Air Flow sensor is contaminated. typically this will throw a code (check engine light aka MIL)
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.