This is an issue I've had off and on for, embarrassingly, at least a year:
On misty or wet mornings, everything starts out fine but, a few minutes into the drive (like clockwork. I even know the lights it will happen at), the Check Engine light will flash for 3 seconds and the car starts to struggle as if it was about to stall if I am going slowly or stopped. Driving again, it goes away. Approach another stoplight, hello car shudder. This goes on until about 10 minutes in once the engine temp hits the perfect 90 in the middle. Boom, problem 'solved'.
I would love to know what I should be looking at to fix here. I had previously been told to start the engine while cold late at night in the dark, to look for visible arcing that disappears once the car heats up. Alas, could not find anything. Granted, VWs hide all the important bits, which further complicates things.
Local VW dealers are scammy, so I'm searching for an out of town one to replace them. That said, I'd love to at least have a clue going in so that I'll be less likely to get ripped off again.