Passat slave 1.8T automatic manual integration, engine jitter, what should I do?

Check throttle, fuel injector, spark plug, etc. , may be caused by carbon deposition, and you said "5. Gasket between the ignition coil and the engine (I don't know what it's called, that is, the gasket that was replaced after oil leakage was found in four holes of the ignition coil);

"That's called valve cover pad. I wonder if the timing belt was removed during the last overhaul. If so, please check whether the timing belt is installed correctly or has wrong teeth.