The car was driven from New York to Montana, and as far as I know it started to overheat in Montana and they towed it back to New York to Mechanicsville, where they ended up fixing a water valve or a water pump and then two weeks later than if it's the alternator but it's still in the shop. It's like nobody knows what's going on, they said that it's idling now, so is it worth me to have it fixed? Should I go to a BMW shop? Should I let them fix it? I need some advice.