WHEN THE CAR IS IDLING OR BEING DRIVEN THE ...

  • Tiny
  • Anonymous
  • 1992 MERCURY MARQUIS
  • 120,000 MILES

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?

Saturday, November 10th, 2012 AT 3:51 PM

1 Reply

  • Tiny
  • Hmac300
  • EXPERT
  • 45,702 POSTS

Scan for codes and check fuelpressure, clean throttle plate with choke cleaner on both sides. Then check for a vacuum leak

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Saturday, November 10th, 2012 AT 4:08 PM

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