There is always a wait for appointments, so mine is scheduled for 10/3. But, the dealer mechanic who did a quick check on the start and idle problems thinks that my start problem is caused by a vacuum leak. That's a new opinion, yet I also remember the previous owner of the car had complained about a vacuum leak on this car -- though he said it was taken care of by his dealer service. Is this something difficult to locate and fix? Could they be right about a vacuum leak? How does a car develope a vacuum leak? How does one prevent it in the future? Thanks.