Stu,It ran perfectly well prior to me crashing the old car.It ran good figures on the dyno and air/fuel was spot on.I used it with this set up for the last 2 years.I know the turbo has the potential for 500hp but all i`ve done since the accident is put everything onto a new shell,same chip and engine harness etc.I haven`t re-wired the fuel pump circuit yet because I`ve got 12.6 volts at the pump.Could it be the engine harness ?If so which sensor wires could cause this ?