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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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 8, 2011 at 1:33 AM
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ASEMASTER6371
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I would have the fuel pressure checked. it could be low causing this issue.

Roy
Dec 8, 2011 at 1:36 AM
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HOMER1967
  • ✓ASE Certified Mechanic
  • 875 POSTS
  • ASE Certified Mechanic
i wouls suspect an overheating ignition component.to many to guess at .i would have it checked out at a local shop.
Dec 8, 2011 at 2:09 AM
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RACINDALE3
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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 11:45 PM
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