Just back (today- the last leg of the trip was 300 plus miles) from a 1,700 mile trip and the car won't start. We got back and the car sat for 3 hours, I drove it 5 miles and now it won;t start. I had it going for about 2 seconds and it was missing terribly. I had the dealer check it over the day before we left and they found no problems. The car operated flawlessly all week on the trip. Any pointers are greatly appreciated.