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1991 Ford F-150

Tiny
ALZIE 12
  • MEMBER
  • 1991 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 113,000 MILES
It reves up and slows down over and over again. It initially started dieing a few times after you first started it then it would smooth out and run fine. After a few days of this it started the reving up and down. If you hold the accelerator at about 2000 rpm or so it still reves up and down without you moving the pedal but doesn't die. If you don't give it quite a bit of gas it will die. It seems to do the same thing on both tanks. Thanks for yur assistance.
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Tuesday, December 22nd, 2009 AT 4:21 PM

1 Reply

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
I would like to check the idle air control valve. Now this is on the side of the throttle body and controls idle. You will need a digital multi meter and simply unplug it and ohm it. Should be 7 to 13 ohms if not then replace it. Let me know what you find here and we will go from there.
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Wednesday, December 23rd, 2009 AT 10:03 AM

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