Did you changed fuel filter and air?tune up,?dirty throttle body,
I believe these cars also have an emissions pipe connecting the two heads in the back by firewall and do become clogged
Check the throttle valve assembly for black /brown deposits causing minimum idle airflow to be off. If throttle valve is dirty, open with hand a clean with carb cleaner and toothbrush.
SOURCE: IAC Solenoid
Buy a can of spray carb/throttle body cleaner from a parts store and clean the throttle valve butterfly and IAC aka idle speed control motor, do this with the engine running, you will have to hold the idle hi to perform this or it will stall, use at least 1/2 can of cleaner, then shut down and disconnect the battery for 5 minutes, reconnect and drive a few days to let the PCM relearn you driving habits.
SOURCE: 1990 Honda Prelude. Low idle after warm up.
Hopefully fixed the problem by setting the idle a little higher. I think the IACV is ok.
SOURCE: car idles up and down only in drive gears not in p or n
iac are are common problem but verify there are no vacuum leaks first
SOURCE: fast idle after warm up .already changed IAC valve
fast idle is many times caused by a engine intake vacuum leak, use a can of carb spray and spray the top of the engine for leaks, if u hit one u will hear the eng change idle speed, also look for split or leaking vacuum hoses.
SOURCE: IAC control valve. Locato\ion 2002 ford escape
If it's not idling and has problems starting, it's probably the IAC motor. It's located on the throttle body. Follow the airfilter box all the way to the engine, where the rubber flex hose attaches. The throttle body should be the first aluminum part you come to. Attached to the side you'll find small little aluminum part with a small wire harness attached. Unplug it, take the IAC motor off and clean inside with carb cleaner. This should fix the problem with the idle.
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Torque converter bad
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