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on throttle body next to Idle control valve.
17 TO 19 INCHES AT A IDLE. 18 to 21 inches at idle, and the above answer is close enoungh too.
check the ait. on yhe left side of carb..it control's idle.
It depends on the year. If you can't get the idle down, check for vacuum leaks. That seems to be a primary cause of high idle, especially for the TBI engines.
This car is computer controlled, and assuming it has the Chevy 305 it is also fuel injected. There is probably a problem in the computer controls causing it not to idle. Do not attempt to adjust idle, as it will not fix it, and may cause other issues when the innitial problem is diagnosed and repaired.
Same with my 1993 Chevy Caprice. Right now I've heard it could be one of the following: Idle Air Control(IAC), Fuel Filter, EGR, O2 sensor, MAP sensor, TPS(changed mines but still surging) and the costly of them all the intake manifold is leaking!
on my 87 Chevy caprice just happen today, my car would idle for a while then die. Turns up my carb was bad. Changed the carb, ran like new again.
vacumm leak problem.
You do not adjust the Idle Air Control as it is controlled by the computor.
You may need to adjust your idle speed or timing.
The idle air control valve is located on the side of the throttle body. It is non adjustable.
A bad idle air control sensor or a bad throttle position sensor.