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2012 Chevrolet Express 1500 4.3L Misfire
Posted to GM Driveability on 11/12/2026 6 Replies

hello i have this van im going dead it is misfire at idle only high speed run good and 0 misfire on misfire on data . another shop did injector wiignition wire and coil spark plug and gave up i check injector signal all good injector kill with scanner numb...

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car Vehicle Data

2012 Chevrolet Express 1500

VIN 1GCSGAFX9C
Engine4.3 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMisfire
OccursIdle
Misc.Misfire

Trouble Codes

P0300Multiple Misfire Detected
Open Help Request

car Vehicle Data

2012 Chevrolet Express 1500

VIN 1GCSGAFX9C
Engine4.3 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMisfire
OccursIdle
Misc.Misfire

Trouble Codes

P0300Multiple Misfire Detected