I drive a 2012 Chrysler 300C. My check engine light came on recently and starting blinking. OBD II reader gave a code of P0803 (Misfire at cylinder 8). I had the car tuned up. New spark plugs, wires, and coils. The engine light is still on and the car idle roughly. I took it back to Meineke and they ran more tests. They aren't able to tell me what's going on. All they're saying is there is something going on with cylinder 8 and I'd have to take it to the dealership to get it diagnosed. Any idea what else it could be?