engine runs great cold but hesitates and stalls when warm

1994 GMC SIERRA
145,000 MILES
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RACINDALE3
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  • 2 POSTS
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.
Dec 7, 2011 at 5:33 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
I would have the fuel pressure checked. it could be low causing this issue.

Roy
Dec 7, 2011 at 5:36 PM
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HOMER1967
  • ✓Experienced 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.
Dec 7, 2011 at 6:09 PM
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RACINDALE3
  • MEMBER
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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?
Dec 8, 2011 at 3:45 PM
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