98 Catera turns over yet won't start
 

I have a 98 Catera. I recently had theCrankshaft Position Sensor replaced. Next the radiator fans ceased to work. The mechanic got those fixed, it started fine, and then the next time he started it it spark flashed and would turn over and not start. He thought he had blown the computer, as did thedealer I had it towed to. When I askedthe sealerto chek out the car to see if it was worth putting a new computer in, less than 50,000 miles on it, it started up fineduring some very wet cool weather after not starting at all for a few days. This went on for a week and then when I went to pick it up it would not start again. May I add that while I trust the dealer, itdid start for me when I went to retreive some sunglasses and we were still in that cool wet weather period, but the next day I was told it again would not start.

Where should I direct the mechanic to look for the problem? Any ideas?

Thanks

Geoff Clark