Could be your idle air control valve, it regulates how much air your car takes in when no gas is applied. It may be stuck closed mostly, causing insufficient air flow when you're not going. This could be the problem. And the hesitating may be your egr valve, which recirculates some of your exhaust back into your cylinders. If your egr valve doesnt open, your motor has to work harder to fill your cylinders with air.
Wednesday, February 6th, 2008 AT 2:05 AM