You may have a vacuum leak, check the gasket under the throttle body, spray some carb cleaner around the base of the throttle body while the engine is running. If there is a leak you will hear a change in the engine rpms.
On my Chevy truck it idles high when its low on antifreeze but if its not that more than likely its usually a vacuum line loose or cracked. good luck.
vacuum leak
check the upper intake manifold gasket,may have a vacuum leak at high operating temps.
see previous answers, but if it idles high it might be the Mass Airflow Sensor. if your car idles too high for too long and you keep driving it, you could burn out the transmission module (very expensive )
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zyou tps might be bad
you might have pulled a vacuum hose off
where is the i.a.c in a mercury muntaineer 2002
Year? Replace ECTS and clean the throttle body
throttle posistion sensor or vacuum leak
daytime running lights for chevys are automatic. you cant turn them off. all you can do is control the high and low beams.
trash in carb or muffler stopping up.