I have a 2016 Chrysler 300c with the 3.6l with 160,000 miles on it. A couple weeks ago I started having a misfire that popped up out of nowhere. At first I thought It was a transmission issue because the car ran fine going down the road, but when I needed to speed up and the transmission shifted down, the car would start shuttering like there was a transmission problem. I took it to the dealer and they looked everything over and found the transmission was fine, it was a coil pack going bad. After quoting me $1000 to change the coil packs I told them no I would do it myself. I did have them service the transmission, differential and had them do the fuel system cleaning and service since I never had those done the whole time I owned the car from when I bought it with 14,000 miles on it. I took the car and this weekend I changed the leaky oil cooler, coils and spark plugs myself. Got everything back together, started the car and now it runs worse than before. My reader is telling me that the #5 cylinder is not firing. I took everything apart again, swapped out the #5 and #1 coils to see if that was the problem and the coils seem to not be the issue because the "problem" didn't switch to the #1 cylinder. Checked the wires for the coil and they looked good, even changed out the spark plug thinking that was the problem. Put everything back together again and started it up and still the #5 cylinder is not firing. After going through everything several times I'm at my wits end. The only thing I haven't changed is the injector. I don't want to go buy a $100 injector just to find out that wasn't the problem either. Is there something I am missing or something? This is a real head scratcher.

 

the early modals were known for valve issues