rough running and lack of top end power

Hi

im having a few issuses with my 300tdi disco 1, it seems to lack power at the top end (in all gears) and when i rev it to around 3.5-4k at idle when the revs come back down it either hunts around 400-500 rpm or cuts out compleatly, Then becomes a pig to restart once it does its at the low revs again eventually coming back up to normal idle but still lacks on power i can hear what sounds like fuel being drawn through the 'sender unit' should this be silent ie could it be air im hearing (dont know what i should be hearing ) ive had to replace the turbo due to my old one being shot replaced the cambelt and a push rod after the belt snapped and the timing was put back correctly, also the sedimenter has been bypassed and has a new fuel filter on it

any ideas im properly stumped :whoosh:

Help lol

It's got a clog in the system put a new sedimenter in and get the injectors cleaned. Thats my first check point.

sedimenter is bypased and all injectors are working fine (have tested them)

Bent push rod lol should of checked them all after the belt snapped