i have a 04 grand cherokee with a 4.0 and it ran like crap last week. it threw a p0304 code which is cyl misfire. i put a new coil pack on and it ran great for a bout a week now i throw a p0204 code. (P0204 (M) Injector #4 Control Circuit Injector #4 or INJ 4 injector bank output driver stage does not respond properly to the control signal.) i can feel the injector clickin where should i go from there?

 

how are ur spark plugs?

 

sounds like a good time to do neon injector swap, I have the 5.2 so I don't think it will work for me

 

plugs are new and good. put in a new injector and still runs bad