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98 Chevy engine stall

Tiny
ROLLEDS
  • MEMBER
  • 1998 CHEVROLET TRUCK
  • V8
  • 2WD
  • AUTOMATIC
I have a 98 chevy 1500 pickup with 5.7 auto. It starts and runs fine till you open the throttle about half way or more. When you get it to that point it stalls or stumbles and it doesn't matter if it sitting or driving. I picks back up and runs fine when you let off the pedal enough. I have checked everthing I could think of. Also there is no codes showing or pending. Any help will be appreciated. Thanks
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Thursday, February 10th, 2011 AT 9:03 PM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
How long since a tune-up? Use a gage and check fuel pressure. If you have the spider fuel system, it is noted for problems.
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Thursday, February 10th, 2011 AT 9:11 PM
Tiny
ROLLEDS
  • MEMBER
  • 2 POSTS
I should have stated what I have done. The fuel pressure is fine, I checked that, I installed new plugs cleaned cap and rotor, cleaned and even replaced the mass air meter, and had the ignition module tested and it showed bad so I replaced that. Still same problem. The tp sensor reads right as far as percentage of being open, as well as the ect, and the mass air.
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Thursday, February 10th, 2011 AT 9:43 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Sometimes the fuel poppets need cleaning. The procedure I saw was a shop procedure, don't know if injector cleaner in the gas tank will help or not?

Compare tps sensor signal to map sensor signal at idle. If several volt difference, something wrong.
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Thursday, February 10th, 2011 AT 9:58 PM

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