In my engine its the number 4 piston that gone. I know for a fact that i've got fuelling problems. I doubt its the injectors but the Fuel Pump is very noisy and i've had fuel leaks popping up all over. Each time I fix one i get another. If i've got a leak then fuelling is gonna be a problem. If the pump or the FPR is knackered than theres gonna be a problem.
Try checking the entire fuel system from front to back. Including all the pipes near the tank for blockages.