hi i have dodge charger 6.4L recently i notice my engine runs rough on idle. I try to take to a local garage and they said spark plugs and #3 ignition coil need to be change. so as unaware of it i follow what the mechanic advice replaced spark plugs and one ignition coil. after that my engine runs the same rough idle. so what i understand that all the parts that he request me to replace is not issue with my car. anybody can give me an advice or any similar issue like mine?

 

Did you ever figure out what the problem was? I am currently having the same issue with my charger cylinder #2. I changed coil pack, and all spark plugs. Have done a compression test, leak test. Tested the voltage going to the plugs and injectors. Smh.. cannot figure this out