1994 Oldsmobile 88 CAM sensor

Electrical problem
1994 Oldsmobile 88 6 cyl Automatic 122000 miles

I was wondering what kind of things does a car do if the cam sensor is going out? My car is stalling, but it only stalls when its ran for a while, my carlot put it on the tester, but they didn't get it on there in time before the car stalled, the code it pulled was for the cam sensor, and I was wondering if tha code it pulled would be right without the car being running with the engine light on?