For the past week and a half my 96 Buick Lesabre has been stalling while driving around town and has happened 4 times now. I would wait about 15 minutes and the car would start again but wouldn't last ong and would stall 10 minutes later. I replaced the Mass Air Flow sensor and the Crankshaft Position sensor today. After I got the sensors replaced, I took it out around town and stalled again and won't start. I plugged in my code reader and get no codes to indicate a problem and the check engine light is not on. The car started to idle a little rough a few months when at idle and went away after some time but don't know if the problem is related. Any Advice would be greatly be Appreciated. Thanks for Reading.

 

A defective crank sensor does not usually produce a fault code.
This is what you might try .
If you know with a degree of certainty that the engine will stall after running 10-20 minutes, open the hood while car is running out in your driveway, and when it stalls, just shoot some cold water on the crank sensor. If it starts right up ,that sensor is defective.