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If its over 50k miles, try cleaning the throttle body with an aerosol throttle cleaner first. You'll have to rev the engine a few times after starting(and may need to apply gas pedal slightly) to burn off the chemicals. This may not solve the problem, but is a mfr recommended procedure for this type of problem.
check for a vacuum leak, possibly an electrical component is not plugged in correctly or plugged into the wrong device (idle air control, throttle position sensor, egr solenoid)
first off.... does the engine over rev on its own? or only after you press the gas pedal?
does your vehicle have a throttle body that is electronic or cable actuated?..if electronic and revs on own could be one of two issues 1) throttle body itself 2)throttle pedal switch on gas pedal)
if cable and revs after pushing gas pedal ..either there is too much carbon built up on the throttle plate or the throttle cable has begun to fail.. remove the intake tube from the air cleaner to the throttle body and inspect
Sounds like you need an axle seal for leak, and rev problem should be idle air contolr valve on Throttle body,If high mileage recommend get new throttle body assembly.Note after replacing T/Body will have high idle till driven for a while.
Either you have a vacuum leak, a bad throttle body position sensor, or a bad throttle body.
If the throttle body is drive by wire (electronic) then it would be a bad throttle body.
If the throttle body is drive by cable (manually driven by a cable connected to the gas peddle) then it would be a bad throttle position sensor.
If the throttle body is bad the check engine light wil lbe on. If it is on have your codes read at your local parts dealer for free, and this will give you a clue as to which pices/parts you need to replace.
Have the car leak tested and the vacuum linse inspected for leaks as well.
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