Hi all, my 2008 tt has an issue starting up cold. When I turn the ignition, it cranks but it stutters as if it's about to stall, then it starts up. Once started it idles and drives with no issue. This only happens when it's a cold start, if the car has been sitting for 5hr+.

I brought it to the dealership they suggest changing the fuel system, since it was under warranty, i agree and they changed teh fuel pump and the problem persists. I changed the battery and checked for battery drain. Nothing has worked so far. A few audi car repair shops i tried also didn't know what was causing the issue.

Does anyone have any suggestion on what it might be?