Pontiac Problems? Ask a Mechanic for Answers ASAP
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Can you give me your VIN# ***** I can see if there are any Service Bulletins?
Does it come back on after driving or after you restart engine?
Does engine run rough?
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Did you replace the spark plug wires?
You probably have a bad plug wire or coil. To verify it is a plug wire you can try swapping plug wires with another cylinder and see if the miss goes to a different cylinder and code. DTC P0303 is for cylinder #3.