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2003 GMC Safari 4.3L Misfire
Posted to GM Driveability on 6/18/2012 32 Replies

This van will misfire & the check engine light will flash when going up a hill, but it has to be a long hill. Going up the hill by my shop (the one I always use to road test), or on a level it runs fine. It sets a P0300 code and if you look at the misfire moni...

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  Related Documents & Media  2003 GMC Safari

 
Message Closed w/Summary

car Vehicle Data

2003 GMC Safari

VIN 1GTDM19X73
Engine4.3 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMisfire
OccursUnder Load

Trouble Codes

P0300Multiple Misfire Detected
Message Closed w/Summary

car Vehicle Data

2003 GMC Safari

VIN 1GTDM19X73
Engine4.3 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMisfire
OccursUnder Load

Trouble Codes

P0300Multiple Misfire Detected