Triton mn stalling

[scumbag]

Got a 2009 triton mn, 140 000km
anycase its newest trick as of today is to stall at the lights, the engine can be restarted begrudgingly and often stumbles and runs rough for abit, run the main battery flat and had to jump of aux battery.

suction control valve is around 12months old and the fuel rail pressure valve was replace last december...so im thinking along these lines off possible failure....fuel system related
engine runs fine when running and make good power, no massive amounts of smoke and no surging that i can notice...
what else would cause it too stall? at idle ? map sensor? any suggestion would be great...its pretty noisey but its always been a very rattly 2.5L even compared to other tritons.... the break downs just never seem to end with this car

[scumbag]

well think iv solved the issue... fuel rail interceptor box thingo was full of water....