MY 2008 touareg starts rough in cold weather. It starts rough idles and then dies after a few seconds?

SOURCE: Starts fine when cold, after running dies on idle then wont start

Sounds like the fuel filter is dirty and needing to be changed. It's cheap and easy to swap out.

SOURCE: COLD START ROUGH IDLE

I hate to be the barer of bad news, but may be the head gasket.

My car started with rough idle. Then very hard to start in cold weather. Next started overheating, but no output from heater. Trickling sound from behind dash board. Overflow bottle overflowing.......

I replaced the water pump, radiator cap, thermostat, coolant, fan belts, power flushed the system. Nothing worked. Some research gave me the answer.

The head gasket leak was allowing exhaust gases to enter the cooling system, displacing the coolant. After use, as engine cools, coolant is sucked back into the system and coolant seeps into the cylinder. This gets worse over time.

First thing you'll notice is the rough idle as the spark plug burns off the coolant in the cylinder. (This is especially true at low temperatures.) If it is the head gasket, the other symptoms will follow as time goes by.

SOURCE: 1998 BMW Z3 2.8 Idles rough when cold starting in wet weather

the problem could be in air mass flow sensor, but it's expensive

SOURCE: 3 symptoms in random! one Car ! 2000 Impala 3800

First thing I'd check is fuel pressure. 55psi

SOURCE: 2003 Mazda Tribute will start, idle rough for a

check the fuel filter air filter and vacuume lines if they all good make sure the spark plugs are making a bright blue spark