the fuel mixture is to lean and it is bogging out the engin or u need the idle control to be tweeked a little
My car idles really high and wont go down and it will stall if I push on the gas!!
clean iac sensor and o ring
does not drip oil after i turn off engine also engine always runs high never winds doen when it is in park
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
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 )
zyou tps might be bad
Year? Replace ECTS and clean the throttle body
where is the i.a.c in a mercury muntaineer 2002
you might have pulled a vacuum hose off
throttle posistion sensor or vacuum leak
depending on the year some impalas have 6 inch glasspacks