2007 A6 2.0 TDI

On startup it sort of 'shudders' into life. So when the engine's fired up the first two seconds or so it shudders rather annoyingly. Worse so when starting with a hot engine??

No faults are displayed and it drives just the way it should. Engine never grumbles and isn't noisy after the innitial start up.

Apart from that it is slow as fuck. Are they any good chipped or still crap?