My car was in for, cambelt, new water pump and all other belts, New DV, oil change and then Revo s1 yesterday. Got car back and guy said its mis firing like hell and said it could be either plugs, coil packs or leaks. I had to drive the car away as its my daily and it drives awful, it just shudders and goes nowhere under boost and tbh it runs like my celica when belt was a tooth out. im devastated. Its and 2002 A6 1.8T and was running beautifully when i took it in. Do i replace plugs and coils and see or do i suggest they did the belt wrong.