Questions & Answers for: GMC p0303

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Question about 2003 Yukon Denali

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i have a p0303 code on my 2003 yukon. i have changed my spark plugs and wire and the problem still exist. can any one help. thanks A MISS DOESN'T SPARK ONLY,COULD BE FUEL RELATED INJECTOR OR ...

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Question about 2003 Yukon Denali

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P0303 CODE this is for eng misfire cylinder # 3 misfire try tune up

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Question about 2001 Denali

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P0303 CODE P0303 is a cylinder Misfire number 3. It can be a coil, plug, injector or intake leak. Thanks Jay!

I have a 1999 GMC Safari AWD that is getting the error code P0303 after replacing the distibutor cap (AC Delco), Button Rottor, Plugs, MAP sensor and rear temp guage sensor. Please inform on what to ...

P0303 Misfire Detected (Cylinder 3) check coil and plug #3 cylinder make sure its not the ECM

Question about 2002 Yukon Denali

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diagnostic trouble code P0303 for 2002 gmc yukon Misfire cylinder number 3. Have you tried replacing plugs and wires or switching plugs, wires or coils between cylinders?

code p0303 misfiring of number 3 cylinder HAVE YOU TRIED CHANGING YOUR SPARK PLUGS. WHEN PLUGS GO BAD THE BEGIN TO MISFIRE.

pulled plugs and oil on #6 cylinder,p0303 code changed coil pack now p0300.sluggish ,no burnt oil from exhaust,possible bad valve cover gasket ? Yes valve cover gasket needs to be replaced, normally ...

My 2003 gmc envoy has p0303 error code. I have since changed the plugs but the code is still there. What else should I look at before changing the expensive coil on cylinder 3? I have a 2003 envoy ...

what does a code p0495 & p0303 mean for 2002 gmc envoy try here GMC Fault Codes

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