I'm currently driving an A3 2.0 2007 sportback. 3 months ago I started having an issue where the car misfires continuously under cold temperature until it reaches about 90, and it seems to subside but not totally. To date I've replaced the coil packs, fuel injectors, fuel pump and the fuel filter, yet the problem still persists. Any advise on this matter would assist.

 

is this the 2.0 tdi or 2.0 turbo motor? If it's the 2.0 turbo not the tdi motor check your high pressure fuel pump see if the cam follower is worn. Most thinking when you did the injectors there was no carbon build up. Post what you find then I can think more in to the issue.