Hello-my passat EPC light is on, and the car keeps cutting off. When I try to restart it, it sounds as if it's going to turn over then wont. So I wait for a few seconds then try it again, then it starts. The check engine light came on, and I know now, that I also need a 02 sensor. Just about 3-weeks ago, I had (one) coil replaced, which they said was bad. I really need help here.