you better take it to another dealership. Sounds like to me they just took it for a joy ride and said they worked on it. Am I also the only one worried that they suggested to use a lower grade octaine to try and fix the problem? I would personally go to the manager and firmly tell them what they did to your car...smoking in it, not wanting to give you a receipt, wanting only cash, and not fixing a damn thing on it. Drive it up here and I will have some good mechanics look at it for you. They don't charge for diagnotics even, only when they fix the car.
