I have a 1.8 tdci or dci focus in with driving problems.

It will sometimes be a problem starting but mainly the problem is the loss of power and thick black smoke. this will sometimes happen when pulling out of a junction or booting uphill. you can dip the clutch let the revs drop then sometimes it will clear completely and off it goes.

I have blocked the egr, changed filter and added fuel treatment( forte) checked all wiring smoked all inlet , cleaned maff, airtemp sensor, checked spill on injectors, removed imv and cleaned, removed fuel reg and cleaned. im starting to pull my hair out now. no codes whatsoever.
the only thing that seems to have made a difference is filter and conditioner but problem still there.

on live data stationary jabbing throttle the rail pressure can hit 139000kpa 13900bar but once it did hit 180000kpa. one time on cranking it did not start but in about 4 turns of the engine it read 800bar i then turned key off then cranked again and it read 245bar and started instant.
any help or ideas welcome.
regards brad 07745564068.