Ffs another issue with rover 220 sdi

Yet again I seem to have another problem with my rover 200.



My car has been intermittently lacking power and feels like fuel cut off or starvation for a second when driving.



I have now managed to pinpoint and replicate the symptoms.



In gears 3-5 if you try to press the accelerator all the way down to accelerate quickly it bogs down for a second and a puff of white smoke comes out at 2k rpm.



If you gently press the accelerator so it gets past 2k it's fine.



What could it be, I have some ideas:



1. Injector number 1 - signs of chafing so I've repaired as best I can.



2. Air in fuel system - bled system, no air bubbles.



3.pump timing - will check today or tomorrow.



4. Bad batch of fuel - used premium shell v power, still does it.



5. Fuel filter - recently changed



What could it be as it's not nice to drive at the moment as I can't overtake particularly well when the power is needed.



Thanks in advance





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