1999 Pontiac Grand Am GT 6 Cyl. with code P0303, evaporative emission control system leak detected

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OBDIITech · Answer 1 · 2017-03-17T02:44:54+0000

The P0303 code means that cylinder #3 is misfiring. You could start by checking the spark plugs.

P0303 PONTIAC - Cylinder 3 Misfire Detected