I've got a running issue with my 1.8T A3.
It idles fine after having a coilpack replaced, and pulls very well until around 4-5.5K where it judders. I thought I had it narrowed down to MAF or N75 valve, however having checked the MAF by unplugging it, there was no difference, so I replaced the N75.
It's still exactly the same - pulls to redline in first and second and then in third will get to 4-5.5K and the judder is back..
I'm guessing there's either a split hose somewhere which I have missed or perhaps I need another coilpack? I wouldn;t have thought it was that though as idle is perfect.
Any other ideas???