my 94 caddy deville would start and then turn itself off. this happened 3 times when I was parked, I kept my foot on the gas for 5 mins. and then it was fine. Next day I didn't have any problems. It started up right away without turning off. Before that I would feel a slight hesitation when I was driving. It was hardly noticed, My mechanic says that the computer test shows it is the cam sensor and it has to be fixed and that I also need a tune up. Do you think that is what is wrong with my car? Could you tell me about how much that would cost? I am a senior citizen and I know nothing about repairs to cars or how much repairs should cost. My caddy has 59,000 miles on the speedometer.