iv had a problem recently with my a3. when i drive normal, it seems to be okay ish. when i put my foot down there a little strugle and slight judder untill the revs get up. Any ideas?

Iv checked all mounts, see to be in perfect order. cleaned the air filter and done everything i could think of.

one other thing that came to mind could be the cold. its a deisel car and recently its been very cold and a hell of a lot of snow. i thought mabie the deiselhas started to wax slightly. deisel starts to turn around -15 o'c. Do you recon it could be that? as soon as the car warms up it seems slightly better.

any advice or suggestions?