1999 Mercury Marquis Rev's up

1999 MERCURY MARQUIS
173,700 MILES • V8 • AWD • AUTOMATIC
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LUCKIE9
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  • 1 POST
In the fall I had a heater core replaced and since then when the heater is on, the car revs up. Recently when it snowed, I let off the accelerator and the car went by itself. The only time it does it is when the heater is on.
Feb 12, 2010 at 10:03 AM
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