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Q: Starting rough. on 2002 Nissan Altima

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The check engine light came and the code p303 I change oil ,spark plugs.The light went off but the car is starting rough .Not a clue what it could be.
(1) Answer
(1) Comments
crank sensor is common failure for hard starting. did you check the coils??? a real diag would have pinned down your problem. you may have damaged the cat conveter with the engine missfires.

Roy
payed over 300 for a diag and i got it could be the fuel injectors but gess what its not know I have a different code p300 .