RPM fluxuation?

[eversio11]

Hey there, I don't know if this is the right forum, I couldn't really find a "troubleshooting" forum. Anyways, I was having some problems with my engine lately. Just sitting in park, the RPMs would flux between 300-1000, then as it got close to stalling, would skyrocket to about 2500 RPM. Repeat. Sometimes it would go to the point of flat out stalling, especially when I went from drive to park.

I'm thinking the engine is not getting the fuel it needs, but I'm really lost. I tried to short out the engine lights but nothing came up, and the service engine light never comes on. Anyone have any thoughts?

[quaddriver]

Originally Posted by eversio11

Hey there, I don't know if this is the right forum, I couldn't really find a "troubleshooting" forum. Anyways, I was having some problems with my engine lately. Just sitting in park, the RPMs would flux between 300-1000, then as it got close to stalling, would skyrocket to about 2500 RPM. Repeat. Sometimes it would go to the point of flat out stalling, especially when I went from drive to park.

I'm thinking the engine is not getting the fuel it needs, but I'm really lost. I tried to short out the engine lights but nothing came up, and the service engine light never comes on. Anyone have any thoughts?

before I tell you what wires to lick, what is it?

[eversio11]

Terribly sorry, I originally posted this in the Cutty forum.

Its a 92 Cutlass Supreme 3.1 V6

Thanks for any help

[MagicRat]

The idle air valve is opening and closing to compensate for...something wrong. Scan the ECM for codes. There might be a oxygen sensor or throttle position sensor that has gone bad. It would be a good idea to remove the throttle body and clean it up including the idle air valve with some carb cleaner and a toothbrush.

[eversio11]

On another forum someone mentioned the possibility of a crankshaft positioning sensor gone wrong. The ECM hasn't shown any codes in awhile, but I'll reset tonite and try again. Thanks for all the info.