MAF?

Hi, posted this as my intro and thought it would be better in this forum...
I've been trying for a while to sort out what I thought was a MAF issue on my 2005 Freelander td4...really sluggish under 2000 revs but when the turbo kicks in it takes off, then when i change up the revs drop below 2000 and its sluggish again especially on gradients...changed 1 injector last year, two different MAFS Peerburg and Bosch still no change. Yesterday I installed a new cam sensor after a starting issue and cleaned the MAP sensor and intake sensor then thoroughly cleaned the intake manifold, i can hear both fuel pumps kick in and changed the fuel filter a few months ago....connected MAF...same issues.it's a little rough on start with some light smoke but this clears... I used an OB2 scanner, no faults (dealer seen the MAP and MAF faults and cleared) and it's reading the MAF, MAP and intake temp values. Been running with the MAF disconnected and it's acceptable but not it's best. Is this now an ECU problem. First time on here and I've read a few posts on MAF problems but I think I can now discount many of these.

I think you are supposed to change all the injectors at the same time and not one every now and then when needed. I would have a look at the turbo boost controller thingy down the rear end of the engine. You can see it from the drivers side wheel. I was having similar problems and found that one or two hoses had a pin hole in them, swappe dthem out and problem went away.