Today when I came to a complete stop my car started to shake and began to under idle again...I haven't had this happen to me for awhile but it has come back to haunt me once again... Well usually the shaking would've stopped and the car went back to normal but today it kept under idling and eventually shut my car off. I tried to start it back up but it wouldn't start; so I just sat there on the road waiting and wala it started up and I went to work. What do you guys think the problem is?