My car would start well when cold and after driving few minutes, the idling goes low at around 600rpm. When approaching a stop or traffic light, once I release accelerator and push the clutch to the floor, the car just switches off. When I start it at that moment, it will smell of half-burnt petrol and no enough power. While driving second or higher gear, it automatically regain and loose power intermittently. Probably FUEL RAIL PRESSURE SENSOR that's failing.