Can someone help me find out whats going on. I have a 2006 cobalt LS. It is starting to stall when the car is idling only or when im in traffic. its fallen dead twice. It is really bad when the conditioning is on but is normally o.k. when off. The headlights dim when the engine starts to stall and when i am parked and rev the engine it is the worst. The car shakes when it is about to go but it normally, the best way to describe to kinda works it self back out of almost falling dead. can someone tell me what could be the causes of this. Thanks!!