Help please,
I have a 2.2 Direct sri, recently i have replaced the fuel pressure regulator, fuel pressure sensor, ecu(second hand), clutch and have modified the high pressure fuel pump. Whilst driving home 2 days ago i noticed a distinct lack of power during acceleration, this has now cumulated in the car sat outside not starting. The car has been plugged into OPCOM and there are no trouble codes present at all which leads me to believe this is purely mechanical. I have noticed a hose into the inlet manifold which goes into some sort of black plastic valve, if the hose is disconnected from the manifold i can get the car started albeit rough as **** and then if i try to accelerate the engine stops.

Any help would be gratefully received