Yet another misfire woe.....sorry!

Hi all.
Ive posted about this in another thread but after much tinkering im nowhere nearer finding the cause of my 'misfire'.

I recently bought a 1999 Discovery Td5. 100000 miles and very comprehensive service history. It seems to have been very well looked after. (if that helps)

It potters around town fine and smooth but as soon as you reach around 2750 revs it just seems to fizzle out as regards power. Its like it just runs out of steam and it does judder a bit like a misfire. any hill is a no no at the moment. Hills that it used to cruise up at 50 in 5th are now barely acheivable and im doing 20 in second by the time um at the top. There is no smoke at any time. Its not like it hits a rev limiter or anything ( i have one of them on my van ) it will carry on accelerating on the flat after 3000revs all be it extremely slowly, its just like im towing a jumbo jet!

So i looked around the forums and a few common faults cropped up ie oil in the loom, (there was no oil in loom but i put a new injector harness in anyway) wastegate modulator, seized wastegate actuator, MAF, stuck or clogged egr, split pipes, all of which ive either changed or found to be not at fault.
Ive also taken the car to have the fault codes read and nothing is showing up.

Im tempted to try changing the fuel pump next but would like to hear anyones thoughts on that as that will probably cost £150 ish and im reluctant to just go ahead and do anything else just to see.

I appreciate that may just have to be what i have to do but thought i really should seek some advice on here before anything else.

Any help or ideas would be most apreciated.

Is that happening just under load or even in neutral when stationary? ... i mean in neutral can u "pump it up" easyly to 4000 rev?

Well sierrafery, when stationary it revs freely up to 3500 but wont go past there. That does seem like a rev limiter, or maybe the limp mode?? nothing showed up on the fault code reader though.

Put new fuel and air filters first... and blank thr EGR

I've had a similar problem, changed the turbo wastegate modulator, no change, renewed the turbo hoses, no change.

Just had the fuel pump and injector harnes changed .

It was one of them because it's got wings now

Just a cautionary note, if you do change the fuel pump, go for the the more expensive OEM one rather than aftermarket. I speak from bitter experience and I am sure others on this forum will echo my sentiments!

have you checked feul preasure yet could have blockage in feul fillter head assy
remove pipe works on filter head check for blockage before you spend any more cash

Thanks all. sierafery, I will try the filters and actually the garage Ive just taken it to told me to do the egr removal too. I must say that prior to the other week when this started happening, it was running like a train and very smooth with it. It just started happening one day.
Mikes lr, thanks for the advice. I will remove filter and check that out. I have to say that it does seem like its just reaching a point in the rev range where its not getting enough fuel. That's what it feels like so I am leaning in that direction. I'll do the filters first and if that doesnt work ill bite the bullet and change the pump.

FIXED FIXED FIXED!!! It was the fuel pump.