Engine rough running not correct P0300 code on code Reader

Question

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

Answer 1

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.