I could use some help. I have a 2010 FFH with 119,000 miles. It has been a great car. I've had all maintenance done through the dealer up to this point. Earlier this week there was a sudden loss of power with rough ride and CEL came on. I checked the DCT's and got P0204 and P0304. I changed all 4 plugs and coils and the car ran great for 1.5 days (about 100 miles). Got the same codes (same cylinder misfire with cylinder injector circuit open). Rides rough with no power. I suspect it could be the wiring to cylinder 4 since every other cylinder seems okay. Does anyone have experience diagnosing this problem and possibly repairing/replacing the coil wiring harness? Any thoughts would be appreciated. Jason