If I were to guess I would say the car is not getting fuel at all, and this term just came up in a search he did and may not be at all what he really needs to know about. That being said, a fuel cut defencer is a device that tricks the ECU into not going into fuel cut at high boost. I would avoid them like the plague on DSMs, and they are of no use at all with a NT car. It will probably turn out to be a bad fuel pump, wiring, or fuel pump relay. Good luck.