last September i bought my first iroc 89 5.7 and this spring i was driving it and every time i came to a complete stop my car would die, but it would start back up. I finally took it to the shop they really didnt know what was wrong. so here i am months later and i still have no answer. so here is what it does after driving for about an hour when i come to a stop my car with either sputter and almost die then catch itself or it will die. i need some help

 

If there's not any coolant bubbling over into the resevoir, then it's not overheating.