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May be idle position sensor.
Vacuum leek
the choke is on
Not really possible. There is an idle speed control on most 1988 v6 machines. If you are experiencing high idle, it may be a broken ISC. The idle speed is controlled by computer. http://www.marksatterfield.com
When I start up my 1988 cherokee laredo the idle is so high and loud it make me get very angry?
did you find a solution yet
The cause of high engine idle and surges in the 1989 Corvette is due to..Read More
You can not adjust the idle screw, it is sealed off at the factory. If you are having a high idle problem check for a vacuum leak or a bad idle air control valve. These will commonly cause a high idle.
a/c kicks on
Either your fuel is burning too rich or you have an idle censor out. new idle censor's are not expensive
Could be a vacuum leak
Check throttle positioning sensor.