I just got a new motor put in my car. I drove it for two weeks with no problem. Yesterday, I was on the highway and the car start jerking, oil light came on, rpm kept flying up and down, and the battery light came on. The car stop when I slowed down. It took minutes to crank it back up. It will drive about a half a mile then sart doing all those thing over. Anyone have an idea whats going on?