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1992 F-150 Surges/Stumbles when warm

Tiny
JLCLJAYNE
  • MEMBER
  • 1992 ALL OTHER MAKES ALL OTHER MODELS
I have a 1992 F150 with the 5.8. It runs good when cold, idling and wide open throttle. It surges or misses when warm and at a constant speed. You can feel a slight miss or hesitation when at cruising speed. The truck is new to me but so far, these are the the things I have done or replaced.

New plugs, wires, cap, rotors. New IAC, cleaned EGR and new TPS. Cleaned throttle body, replaced air and crankcase filters, new pcv valve. I have checked timing, checked vacuum hoses and tried to find any intake air leaks but have not found any.

I haven't checked fuel pressure or tested anything with a vacuum gauge as I do not own any. Yet.

Please help! What might be causing this irritating problem?
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Thursday, April 19th, 2007 AT 1:10 PM

4 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
After changing all this is the engine light on? Does this truck have sefi or carb?
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Thursday, April 19th, 2007 AT 2:19 PM
Tiny
JLCLJAYNE
  • MEMBER
  • 4 POSTS
There has never been a check engine code. None stored either.
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Thursday, April 19th, 2007 AT 3:27 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Fuel injected or carb?
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Thursday, April 19th, 2007 AT 3:30 PM
Tiny
JLCLJAYNE
  • MEMBER
  • 4 POSTS
Fuel injected. Installed new EGR and EVR sensor but still have the problem. I even tried a new EGR vacuum solenoid but problem still exists.

Truck runs great when I disconnect the EGR.
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Tuesday, April 24th, 2007 AT 10:39 AM

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