Engine Revs up when car is in park

1998 MERCURY SABLE
215,000 MILES
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SABLEGIRL415263
  • MEMBER
  • 1 POST
When my car is in park, it sounds like someone is lightly pressing on my gas petal and my RPM revs up to 3. any reason why? I tried to see if it was the mat on my floor pressing against the petal and it wasnt, I have no clue why it does this, it just starting happening and it only happens when its in park.
May 25, 2013 at 12:08 AM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
First eliminate all vacuum or air leaks in the system. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
May 25, 2013 at 1:21 AM
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