My car turns off while driving!?

I have a 95 nissan maxima. My car randomly shuts off on stop lights or sometimes even when I would be slowing down my car the car would just die. Now I have changed the alternator, knock sensor, fuel pump, fuel filter and thr ECU, but still the same problem is occuring. My check engine light is on as well and after replcing the knock my mechanic cleared the codes and the light when off, after a bit driving around the light came back and the car started jerking and hestating and on the stop light it turned off, cleared the codes and happened again. Later on i got a new fuel pump and filter, but didn't work. Just recently got a new ECU(electronic control unit) and the car did the samething, but except this time the check light didn't come on. Need help plzz. I'm totaly pissed!|||Spark plugs? Check em all. And all the spark plug wires.|||This could be a dirty air flow sensor. Usually located between the air filter and the throttle body. Good luck.|||What was the code when your light was on?