If you don't know the history of the car, I would start with spark plugs and and check the coil pack connectors while you're doing it. My experience is these 1.8T's need good plugs. Good find of a car too. Congrats.
I just purchased 2003 TT 225 with the same problem. We thought it was the gasket between the turbo and manifold, we replaced the gasket. First test drive no problem but 2nd test same problem. I have a forged 007 I’m going to install it soon I’ll let you know how it goes.
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If you don't know the history of the car, I would start with spark plugs and and check the coil pack connectors while you're doing it. My experience is these 1.8T's need good plugs. Good find of a car too. Congrats.
I just purchased 2003 TT 225 with the same problem. We thought it was the gasket between the turbo and manifold, we replaced the gasket. First test drive no problem but 2nd test same problem. I have a forged 007 I’m going to install it soon I’ll let you know how it goes.