I have a 2010 charger srt8 with the 6.1 hemi engine. Recently had a misfire in cylinder 7, had all spark plugs changed along with the coil packs. Drove home and felt the misfire again. Code stated cylinder 7. Took it to the dealership, they swapped injector 7 with injector 5, tested fuel pressure and had it running good. A day later same thing, cylinder 7 misfire. What should I have checked next?