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01 gmc sierra

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  #1  
Old 11-22-2011 | 08:08 PM
Sikness's Avatar
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From: Busby, alberta
Default 01 gmc sierra
Need help! Truck has a po300 random miss fire code. Starts fine and runs fine, when i get up to 80 kms a hour truck looses power and has a nasty chug. New plus and wires and i just replced the maf sensor, checkd o2 sensor and all is good! Clueless.... HELP!
 
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  #2  
Old 11-23-2011 | 06:06 AM
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From: New Hampshire
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Clogged fuel filter?
 
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Old 11-23-2011 | 09:49 AM
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Nope changed that too
 
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Old 11-23-2011 | 10:17 PM
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From: Pennsylvania
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Crankshaft and camshaft position sensors. check them both.

also are your coils fine?
 
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