Today i was warming up my car and all of a sudden the idle just went downs and the car died. I tried it back up again and it started up fine but died again. I heard a sound like something popped of. and when i turn it on i can hear a whistleing sound some where in the intake manifold/TB/upper water pump area. the car starts fine and it drives but i just cant be at a stop with out me reving the car at 1-2k or else it dies.