1992 Mercury Marquis Car Idling Being Driven Engine Will Rev Minute Back Idle

1992 MERCURY MARQUIS
120,000 MILES
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when the car is idling or being driven, the engine will rev for a minute then go back to idle or to the normal acceleration level. what causes this?
Nov 10, 2012 at 7:51 AM
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HMAC300
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  • 48,601 POSTS
scan for codes and check fuelpressure, clean throttle plate with choke cleaner on both sides. then check for a vacuum leak
Nov 10, 2012 at 8:08 AM
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