It doesnt happen every time, but twice so far I have started and restarted the car and had the engine stall. I start the car and it feels like its not on, and it has a really low idle (300-400) rpms. When I rev the engine it goes up, but then the car shakes when it gets back down to less than 1000. Once I turn it off and start it about 3 times it runs normally. The first time the engine was cold for a while, but today it was only off for a max of two hours before I had the problem again. Any ideas?