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Q: wont idle on 2000 Ford Excursion

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when i first start it wont idle but when it warms it will only idle at about 500 rpm there is also no engine light lit up to pull a code any suggestions?
(1) Answer
I would clean out the idle air control valve, they get dirty and cause this problem, if that doesn't help, clean the throttle body.
good luck