I HAVE A 91 GMC C3500 WITH A 454 IT'S A 5.7 ENGINE AND ITS RUNNING LIKE CRAPE WHEN I TRY TO DRIVE IT IT WHANTS TO STALL OUT

Asked by Sep 06, 2015 at 07:43 PM about the GMC C/K 3500 Series

Question type: Maintenance & Repair

I HAVE A 91 GMC C3500 WITH A 454 IT'S A 5.7  ENGINE AND ITS
RUNNING LIKE CRAPE  WHEN I TRY TO DRIVE IT IT WHANTS TO
STALL OUT THE IDEL GO'S UP AND DOWN  SOME TIMES WHEN I
COME TO A STOP IT CUTS OFF I UNPLUG THE TEMP SWITCH AND IT
RUNS BETTER BUT AT HIGH IDEL  STUFF I DID SO FAR BUT NO LUCK  
I DID A FULL TUNE UP AND THE FUEL PUMP  I CHANGED THE TEMP
SWITCH  SPARK PLUGS AND ROTA  AND CAP AND SPARK PLUG
WIRES PCV VALE OIL OIL FILTER AND I REBUILD THE FULL
THROTTLE BODY  I CHECKED THE TPS SENSER  AND STILL NO LUCK

2 Answers

20,175

does it have codes??it must...

YEA CODE 15- coolant sensor or circuit/ low temp indicated I JUST INSTALLED THAT SENSOR LAST WEEK NEW FOR AUTO ZONE BUT IT STILL DOING THE SAME THING THE IDOL NORMAL THEN DROPS DOWN LOW AND GO'S BACK UP WHEN I STOP A THE LIGHT SOMETIMES IT CUT'S OFF OUT OF NO WHERE AND IT STARTS RIGHT BACK UP

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