Starts perfect from cold and drives Very well, once engine reached running temp and switched off will not restart, it fires up then cuts off as if immo fault, if you wait ten minutes it will start or if you unplug coolant temp sensor it will also start, spill test carried out and injectors tested by reputable diesel centre, cranking fuel pressure 290 bar at idle 320 bar pulling my hair out now any ideas would be helpfull

Thanks in advance Andy