I have a 130TDi Sport B6 A4,
I'm finding very recently it's got rather sluggish and almost hesitant, then it kinda spools onto the turbo and feels absolutely normal!
It only seems to have come on very recently, and the weather is very damp (we have lots of rain, i live in Gloucestershire! lol!) I'm wondering whether it's the damp that's causing the problem!