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1994 Ford F-250 Check engine light

Tiny
BUMP62
  • MEMBER
  • 1994 FORD F-250
  • 165,000 MILES
When starting truck it high idles and takes long time to come down then drive it come to either stop light or go to park still high idles bad then while driving if check engine light comes on power seems to be reduced some then when light goes out transmission shifts hard into gear I have replaced the TPS about a year ago have had recent tuneup and oil and filters any help would be appreciated thanks
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Sunday, July 14th, 2013 AT 1:50 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Check for vacuum leaks and check the idle air control valve (IAC) located on the throttle body. The IAC is responsible for the engine idle speed.
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Sunday, July 14th, 2013 AT 7:42 PM
Tiny
BUMP62
  • MEMBER
  • 2 POSTS
Thank you for info I will check that
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Sunday, July 14th, 2013 AT 10:57 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Let me know what you find.
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Monday, July 15th, 2013 AT 8:43 PM

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