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2005 GMC Sierra 1500 5.3L Poor Idle Quality, Misfire, MIL Lamp on
Posted to GM Driveability on 5/21/2007 6 Replies

customer came in with rough idle. scanned computer and found code [...] cylinder misfire checked and replaced spark plug on #5 due to almost all misfires recording on that cylinder. removed fuel rails and cleaned injectors and performed motorvac as we have see...

FIX posted 5/22/2007

6 Replies Received (View Replies)

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car Vehicle Data

2005 GMC Sierra 1500

Engine5.3 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Misfire, MIL Lamp On

Trouble Codes

P0300Multiple Misfire Detected