Questions & Answers for: GMC Envoy p0303 code

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...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 for sluggish I would be looking at a ...

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...code p0303. It has a bad idel at low rpm. I have cleaned the throttle body and mass flow sensor, and it helped a lot. It's now idle at ~1000rpm. After doing that I was able to get the error ...

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...code appears with P0303 (the last digit refers to cylinder number), then you have found the culprit - bad spark plug. If the code reappeared with P0302 (Cylinder #2 again), then swap out the spark ...

...P0303, P0304 etc. etc.P0308. The P0300 code refers to "Random/Multiple misfires" whereas the other codes refer to that particular cylinder (last digit) misfire. The P0300 code sets when 2 or more ...

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