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I Changed my coils out Replaced Spark plugs with bosh and put in new igntion coil housing 2.4 L Twin Can 2001 Grand Am and it still is mis firing or running to lean or somthing it is rough ideling and isnt runnig correct any sugestion I plug in my code reader and its just says P0300 Engine mis fire what going on

Vehicle: Car 2001 pontiac grand am 2.4L

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HI there,

Check for intake manifold gasket leaks and also check and make sure the catalytic converter isn't plugged up from the original misfire issue.

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