Newbie here. I drove the car on the prior day after a 3 day cold snap. I was driving for about 20 minutes and felt the engine slowing as I neared a stop sign. It died. Glow plug light comes on, all lights come on, engine cranks but doesn't start. I had heavy smoke after starting since I bought the car in June of 2012, but thought it was normal because it is my first TDI. The check engine light is intermittent, and not predictable at all. It just comes on at random times. Any thoughts?