1989 F-150 4X4,302 5.0 engine

Tiny
TIMBO
  • MEMBER
  • 1989 ALL OTHER MAKES ALL OTHER MODELS
My 1989 F-150 revs up and idles erratically. It only does this when it warms up. It does it worse when it is warm weather. When sitting still in gear it revs up and jerks. It sometimes does go dead. The engine was taken out of a Grand Marquis, but don't know the model.I have changed the m.A.P. Sensor, throttle position sensor, fuel filter, fuel pressure regulator, and I've also cleaned the egr valve and changed the egr valve sensor. Could you please tell me what is wrong?
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Wednesday, February 7th, 2007 AT 7:34 PM

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Tiny
RASMATAZ
  • MEMBER
Check the fuel pressure
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Thursday, February 8th, 2007 AT 1:35 AM

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