When I got my injectors clean and my fuel filter changed I was told one of my lines had a leak. Since then my car would shut off at just about every red light or while in idle when parked. Before it happened every once in a while. Could a leak from one of the fuel injectors cause this?
Cheapest thing is to clean your IAC(Intake Air Controller), it may be sticking so when you come to a stop it remains closed and the engine can't breathe.

-Chris
so did they not tell you exactly where the leak was?