1992 Buick Century 92 Buick Century Stalls

The problem happened once on the first day then quickly got worse in the next couple of days to the point where it would stall out 3 times when going a distance of 5 miles. I never noticed the check engine light coming on. Sometimes, when going about 40 m.P.H, the engine would stall, all the engine lights on the dash would light up, and just as quickly, the engine would start and everything would appear normal until it would stall again.
Other times the engine would stall when going just 20 m.P.H and not start again until I would wait for 5-10 min. When I replaced the fuel filter the engine started immediately after I turned the key even though a lot of the gas had drained from the line. Of, course the engine was cold. Would a fuel pump problem get worse as the car/pump warmed up?

I finally took this car to a mechanic. He let it run for about a half hour like I did. It stalled out for him but started right up so, he could not get any diagnostic codes. He started wiggling sensor wires. When he wiggled the crankcase sensor wire, the car stalled. He replaced the sensor and so far, so good but, its only been a couple of days.