trouble again

hi people me again ave got a 03 td5 disco and i have a prob again which is it sounds like its missing at idal
this is what a have done so far

tested the ruggedness of the injectors with the hawkeye and all was 0+2 max

testted maf which was about 30 at idal; so unplugged wich made no diff which was new not 6 month ago

fitted a new fule reg (but not the o ring as dint ave one used old no leaks)

new fule fillter and cleaned pump out

ecu had littal oil in not much so cleaned out (new injector harness)

turbo wastgate is free


so now am lost what to do next the disco as had a remap about year ago and run fine it all so as straight through exhaust can any one helkp me with this one plz

Me again went for a run in the td5 and when I got back I turned off and back on agen the flue pump ran is this normal or is there air getting some where plz need help people
T

normal it comes on when ignition turned on

job done people well almost its the sensor that works the wastgate must be the prob taken it out of line and missing as stopted
now going to run it like that for abit til i get a new one
what will happen if its not replaced ? any one no

ummm,

does running without that not leave you risking overboost and damage?

MW