Does the rpm drop before the engine dies, does the car act as if it running out of gas, does the car start to idle rough and then die, do you come to a complete stop and the engine cuts off at the exact second you stop or does it stop running a few seconds into the stop, or those the engine die when you start to take back off from the stop? Many questions, but all can mean different problems. Tell the forum more about what is happening just before everything stops working, like can you smell gas, etc.