why does my engine stall/turn off when I come to a stop light ?

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my car will crank up and run perfectly fine and it will drive for a lil while, when the temp gauge gets about halfway, and I come to a stop light the engine will turn off. the "check engine" light is on also as well. when it shut off, I let it sit for about 30min.-1hour and it will crank back up and run but it will began to overheat and when I come to a stop sign or a red light the engine will turn off again , I'm not sure whats wrong with my vehicle, can anybody help me , the battery is good , the alternator is fine , I just had my power steering pump replaced , when it blew the was oil all over the place, but eventually was burned off , the serpentine belt is good. can somebody please help me.