Cold start valve
The Cold start injector is controlled from a sensor in the back of the head or block (it's been a while). This decides for how long the cold start injector operates for depending on water temp. If possible connect a lamp to the valve and see how long the injector fires for when starting from cold. It may be running for too long and flooding engine or not at all. Most of the problems with these are with it flooding and many leave this injector permanently disconnected. Especially those with Ur quattros!!
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