Vehicle misfires under load, engine reved up to 2500-3000

Tiny
ISLANDTECH_925
  • MEMBER
  • 1995 GMC SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 250,000 MILES
95 GMC K2500 4X4 7.4L TBI.
I AM BACKFIRING UNDER LOAD, WHEN ITS COLD IT RUNS ROUGH THEN IT SMOOTHS OUT. IDLES AT 900-1000 RPMS. IT ALSO MISFIRES WHEN ITS COLD AND TRANSMISSION IS IN DRIVE? INTAKE MANIFOLD GASKET WAS REPLACED, TUNE UP DONE, PICK UP COIL REPLACED, COMPRESSION NORMAL @ 150 PSI.
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Wednesday, May 25th, 2011 AT 7:31 PM

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Tiny
ERNDOG66
  • MEMBER
Did you replace plug wires during the tune up?
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Monday, May 30th, 2011 AT 4:31 PM

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