You need to find out why your CEL (Check engine light) is on. Fix the codes that it is throwing and you may fix your problem.

Does the car restart after it stalls? Does it only do it when the car is at normal operating temperature? Does it happen after driving the car for a long time, or does it happen all the time?

More information is needed to really make sense of what is going on. But ultimately, your best bet is to find out what codes your car is throwing and go from there.