96-S-10 occasionally won't start when hot

96 S-10 4-cyl, 5 speed, occasionally when hot, the engine will start, only to set there and chug-a-lug until it stalls, it will not accelerate. It will do it on those quick stop in and out of store, etc.. After cooling off for 15 to 20 minutes, it will start and run as normal. The check light is not on.