The thing is he was running a LS/VTEC combination. First thing, a LS motor comes from a regular Acura Integra LS (model). He "Frankensteined" the engine by putting a VTEC head onto the LS block. There is a lot of work needed for this type of swap, and if you don't know what the hell you're doing it'll just shut off like that. I think he didn't know EVERYTHING he needed to know about this swap. I don't think MTV actually went out and studied to see how much stuff those kids knew. They just went to a place where they "heard" about street racing going on and decided to interview them.
On the other hand, if you KNOW what you're doing, your car won't shut off like that all the time.
But then again, if you look at the drag racers, some of their cars stop working all the time as well.