I need help!! 1986 camero 2.8 V6

[Darksige a.k.a Speed]

Hey i am starting to have a problem where the car will shut off after running for awhile and coming to a complete stop. I also hear a lil rattleing coming from somewhere in the engine bay. What am i looking for and what could posibly happen after time? I can start the car at the begining of the dat no problem and i only hear the noise when i am on the gas. I am thinking it may be the timing but i need some advice before i go paying for something thats not the problem.