2003 Chevy Avalanche cylinder misfire

2003 CHEVROLET AVALANCHE
89,000 MILES • V8 • 4WD • AUTOMATIC
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CARL KINGSBURY
  • MEMBER
  • 1 POST
What would cause #4  cylinders to misfire at the same time. And suggestions for repair
Jun 29, 2008 at 11:00 AM
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RHALL77
  • CAR REPAIR CONTRIBUTOR
  • 3,361 POSTS
possible bad head gasket, bad injector wiring, bad PCM, bad plug wires, injectors need to be cleaned. Most likely a vaccum leak at the intake manifold. there can be a whole list of things. did you check to see if thre was spark at the plug wires and injector pulse at the fuel injectors. also check for a vaccum leak at that point of the intake
Jun 30, 2008 at 7:52 AM
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