Question, engine light came on in wife's 2010 charger with the 3.5. It was the 303 code I believe, indicating #3 misfire. It has 62k so I changed the plugs and the #3 coil pack.

when it idles it is still like it is mis-firing and idles "hard".

Any ideas?

 

my dad allways said try the cheapest and easiest things first. i would run some marvel mystery oil first. 4 oz to 10 gal gas. to try to clean the injectors. it may take a tank or two. but dont stop trying other things.

 

Probably going to need a cylinder head. You still have power train warranty, take it to the dealer. If you want to confirm it yourself, go rent a compression gauge from part store and use it on Cylinder 1, 3, and 5.