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1991 Ford F-150 high idling

Tiny
MARYZMAN
  • MEMBER
  • 1991 FORD F-150
Engine Performance problem
1991 Ford F150 V8 Two Wheel Drive Automatic

my trucks idling is messed up and I cant figure out whats wrong with it. When I first crank it in goes up and down from 500 rpm to about 1500 to 2000 rpm if I let it idle like this for about a minute it will die. If I drive somewhere and pull it in park it revs up to about 3000 rpm. Ive replaced the IAC, fully tunned it up, replaced the intake gasket. I dont know what else to do. Please help!
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Wednesday, May 12th, 2010 AT 11:04 PM

4 Replies

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Have you checked vacuum system for any vacuum lines that are damaged, loose and leaking?
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Wednesday, May 12th, 2010 AT 11:43 PM
Tiny
MARYZMAN
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Where would I be able to get a diagram of all my vacuum lines? Ive look but I havent noticed any damaged!
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Thursday, May 13th, 2010 AT 4:20 PM
Tiny
BLUELIGHTNIN6
  • MECHANIC
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What engine you got?
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Thursday, May 13th, 2010 AT 8:44 PM
Tiny
MARYZMAN
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  • 4 POSTS
It has a 302, 2wd and its cpi
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Friday, May 14th, 2010 AT 12:09 PM

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