The Passat gave us a nice gift this morning. My wife said it started rough, but after punching the throttle a bit, everything was fine.

I took it for a short drive and had no issues. It ran smooth enough and wasn’t limping. Maintenance is all up-to-date but I’d need to check what’s next. It may soon be time for a major service (plugs, etc). The car has been more or less just sitting for a number of days in cold winter weather. It's a 2008 with the 2L turbo. 

So, what do I do? Just drive and wait for it to happen again? Run straight to the garage? Throw a ton of parts at it and see what happens?