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2003 GMC Yukon XL 1500 SLT 5.3L Misfire
Posted to GM Driveability on 10/28/2009 7 Replies

misfire cyl 2 at idle only off idle no miss fuel pressure 48 psi flow good swapped injectors and coils with no help vacuum steady machine shop vacuum tested valves and cylinder said no problems fuel trims 4 while misfiring any other help would be great

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  Related Documents & Media  2003 GMC Yukon XL 1500 SLT

 
Message Closed w/FIX

car Vehicle Data

2003 GMC Yukon XL 1500 SLT

VIN 3GKFK16Z43
Engine5.3 L / 8 cyl / FLEX
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMisfire
OccursIdle

Trouble Codes

P0300Multiple Misfire Detected
Message Closed w/FIX

car Vehicle Data

2003 GMC Yukon XL 1500 SLT

VIN 3GKFK16Z43
Engine5.3 L / 8 cyl / FLEX
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMisfire
OccursIdle

Trouble Codes

P0300Multiple Misfire Detected