well i was driving the car and its was a really bad wintery day yesterday but i drove to my buddys house and there was no problem and then when i was leaving i was driving and as i was driving the rmp kept on kind of like jerking and it would get to a point were rpm would gobelow 1 and then the car would just shut off and when i took it to the mechanics he said there was nothing wrong when he did a engine and body scan..do you know what the problem is?