i have a 2005 ford mustang, i went on vacation for a week, came back to a dead battery. charged the battery and have had no problems with it since, but, i have a rough idle now. sprayed throttle body cleaner in and idle seemed to clear up, except when air conditioner is on, it will idle all the way to 0 or die when pushing in clutch and coming to a stop. idle is only idling at 500 rpms to 700 rpms with no air on. is there anything else i can try before taking to a mechanic and spending alot of money.