My a3 2.0 tdi when sat on tickover the car shakes, i have added a can of bg244 fuel cleaner along with a full tank and the engine seems smoother and it had a cambelt yesterday! (Used te lolypop tools) to time it up! The vibrating goes when i put it in gear and feel for the bite abit! I read the codes yeaterday and it said glow plug 3 curcit problem cleared the code and read it again today and it says glow plug 2 problem? Wondering if its either the dmf or maybe the injector loom? Any ideas? Car dosnt do it cold i dont think!