below the air intake on the throttle body
the idc or idle air controller is located on the left of the engine under the throttle body
when the engine starts and is warming up the idle is supposed to be at around 1500 rpm but when the engine warms up the idle should drop to between 700 and 1000 rpm. if it doesnt drop then see a mechanic because it is a very complicated fix
check and or clean air idle speed motor
Vacuum leek
Could be the carburetor/idle speed out of adjustment, possibly a vacuum leak
Probaby a sensor.
the choke is on
did you find a solution yet
Im not a mechanic but I had Idle Problems with my 94 Dodge Stealth for a while, i did a full tune up including Distributor cap and rotor button, and put some fuel injector cleaner in with a full tank of gas and it runs much better. Of course that's if checking the actual idle doesn't work, which i believe is easily adjustable, and located somewhere under the distributor assembly.
The cause of high engine idle and surges in the 1989 Corvette is due to..Read More
A bad idle control module will make it race up to about 3000 r.p.m. when in park.