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2004 GMC Sierra 2500 SLE 6.0L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on
Posted to GM Driveability on 9/28/2018 32 Replies

When you first start after sitting all night or about six hours, runs good for about 15 sec. then starts rough idle missing and won't take fuel pops back through air intake, white smoke looks like fuel smoke not anti- freeze, not running hot or adding flui...

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car Vehicle Data

2004 GMC Sierra 2500 SLE

VIN 1GTHK24U24
Engine6.0 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp On
OccursCold

Trouble Codes

P0300Multiple Misfire Detected
Open Help Request

car Vehicle Data

2004 GMC Sierra 2500 SLE

VIN 1GTHK24U24
Engine6.0 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp On
OccursCold

Trouble Codes

P0300Multiple Misfire Detected