automotive

2002 GMC SIERRA
75,000 MILES • V8 • 4WD • AUTOMATIC
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MELSIE
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2002 gmc sierra 4.8 litre bank 1 firing ok bank 2 all 4 plugs are black. checked coils and injecters ok. what could be the problem?
Feb 15, 2011 at 2:25 AM
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PROTECH1980
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Is there a check engine light on? If so I would get it scanned and start my diagnosis there. sounds like a possible o2 sensor problem but without knowing any trouble codes its hard to say. hope this helps
Feb 15, 2011 at 2:39 AM