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Engine runs great cold but hesitates and stalls when warm

Tiny
RACINDALE3
  • MEMBER
  • 1994 GMC SIERRA
  • 145,000 MILES
I have a 94 gmc z-71 pickup with a 5.7. Engine runs great when its cold but hesitates and stalls after its warmed up and I give it gas. I have changed plugs, wires, cap, rotor, pcv, fuel filter, check timing. It idles good cold or warm. Any ideas? I got this truck from relatives and it ran much worse when I got it.
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Thursday, December 8th, 2011 AT 1:33 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would have the fuel pressure checked. It could be low causing this issue.

Roy
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Thursday, December 8th, 2011 AT 1:36 AM
Tiny
HOMER1967
  • MECHANIC
  • 875 POSTS
I wouls suspect an overheating ignition component. To many to guess at.I would have it checked out at a local shop.
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Thursday, December 8th, 2011 AT 2:09 AM
Tiny
RACINDALE3
  • MEMBER
  • 2 POSTS
I forgot to tell you that if I mash the gas it runs good. Also i've had it put on a computer and no codes show up. Almost feels like the choke is stayin on. What about the engine temp sensor? Does that control the fuel mix?
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Thursday, December 8th, 2011 AT 11:45 PM

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