This is what my local mechanic thought as well. He suggested pulling the fuel injector and cleaning, but he is an independent mechanic that primarly works on foreign cars but he does not the Audi tool to pull the fuel injectors. Closest Audi dealer is 2-3 hours away and then there is the price to pay Audi labor. I am not a mechanic but I have read more than I can imagine about misfires - EGR valves, bad wiring assembly, etc. Any other thoughts?