BACKFIRING GMC

  • Tiny
  • brookemontb
  • 1988 GMC Truck
  • 6 CYL

88 gmc 90 motor backfires and pops on hills when heavy accleration is applied. What wrong tried new plugs

Wednesday, January 12th, 2011 AT 4:11 PM

1 Answer

  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

Maybe weak ignition coil pull wire see if spark is blue/white if orange/yellow replace

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Wednesday, January 12th, 2011 AT 8:56 PM

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