The other day I was in a friends driveway waitin for them to get out, and I put the car in park, about 20 seconds later, the car started to shake midly, then the engine almost cut out, and then shook and chugged up again, then it did it again awhile later, what the heck happened there??? also, when I put it in reverse, it shakes violently, sometimes (not all the time) whats going on here?