I have a 2006 Q7 4.2 FSI and its started misfiring and the engine light came on. It gave me codes for misfire on all cylinders. The car is at 122k but the engine was replaced at 76k. Compression is also jumping all over the place. Codes showing: P0300 P0301 P0302 P0303 P0304 P0305 P0306 P0307 P0308 Does anyone have any experience with these engines?