engine miss firing

CHEVROLET CHEYENNE
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STOMMER
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I have a 1998 1500 with 122,000 miles and 4.3 liter engine. I have a intermitten miss fire, especially in the mornings. I have replaced spark plugs, wires and cap and rotor. I have replaced fuel filter and ran injector cleaner through fuel system. I have tested coil and it test good. Some times I will get Code P330 which is radom miss fire. So far nothing has changed. Please help
Aug 2, 2007 at 4:21 AM
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RASMATAZ
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[quote:80cbfa53cd="stommer"]I have a 1998 1500 with 122,000 miles and 4.3 liter engine. I have a intermitten miss fire, especially in the mornings. I have replaced spark plugs, wires and cap and rotor. I have replaced fuel filter and ran injector cleaner through fuel system. I have tested coil and it test good. Some times I will get Code P330 which is radom miss fire. So far nothing has changed. Please help[/quote:80cbfa53cd]

PO300 is normally caused by vacuum leak and bad petrol. check this out then report back.

Your options: you can have the fuel lab tested or use a vac gauge to track the vacuum.
Aug 18, 2007 at 11:37 AM
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