The first thing to check if a fuel injected car is idling high is look for (listen for) a vacumn leak. look for a broken vacumn hose. 2nd, check the idle air control (the IAC) - However, if it is a carburetted car then you need to set the idle lower.
2004 chevy cavalier is idling to high
Vacuum leak.
Throttle plate stuck?
clean your injectors.
Idling too high?
iac or tps
Yes - You have a vacuum leak
Too high of an idle could be producing too much fuel for your jets to work with
set the idle down on the carb
My engine is idling too high. How do I adjust the idle speed?
my idling on my 2001 ford focus is not idling correct, tried to adjust idling but there is no screw or way to adjust why?
If your vehicle is idling high to low when its not moving, chances are you have an issue with the transmission. It may need to be replaced fully or simply fixed.