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International Automotive Technicians Network
2003 GMC Sierra 3500 6.0L Misfire
Posted to GM Driveability on 5/17/2006 19 Replies

Hi group. We are having a real difficult time to fix a code [...] 3500 truck. MISFIRE IS ONLY DURING IDLE. On scanner shows misfire on #7 and #8 cylinder. As soon as I raise the RPM TO 1300. MISFIRE DISAPPEARS and engine runs smooth. other repair shop replaced...

19 Replies Received (View Replies)

  Related Documents & Media  2003 GMC Sierra 3500

 
Message Closed w/FIX

car Vehicle Data

2003 GMC Sierra 3500

VIN 1GDJC34V23
Engine6.0 L / 8 cyl / GAS
Trans5-speed Automatic (Electronic)
DeliveryFI / SEFI
EmissionsOBD-II Compliant
SymptomsMisfire
OccursIdle
Misc.Pick Up

Trouble Codes

P0300Multiple Misfire Detected
Message Closed w/FIX

car Vehicle Data

2003 GMC Sierra 3500

VIN 1GDJC34V23
Engine6.0 L / 8 cyl / GAS
Trans5-speed Automatic (Electronic)
DeliveryFI / SEFI
EmissionsOBD-II Compliant
SymptomsMisfire
OccursIdle
Misc.Pick Up

Trouble Codes

P0300Multiple Misfire Detected