Disco 2 Strange lack of power of a td5

Hi everyone,
I have been planning my holiday to Spain doing a road trip across France and finishing off in Spain.
I have been suffering this power loss for a long time and had a breakdown due to a faulty fuel pump so a couple weeks ago I decided to change everything in order to make a more reliable car.
I have done the following so far:
Fuel pump change
Egr blanking
New water pump and thermostat
Injector harness
Turbo waste gate
New MAF (vdo)
New air filter

After this, the car run stunning, a completely different car.
Road test for a few miles and perfect.

I set off yesterday for my holiday, the car was loaded with luggage but no problems and after about 275 miles in a hill I put the foot down in a hill and suddenly it struggled to pass beyond 2700 revs. I kept going with the trip and felt the car lazier but ok (in downhills is like it recovered a little the power loss) in flat road and struggling in hills (at least it w able to keep the speed doing 70mph)
But the strange thing came after a long stop for refueling and having some dinner. The car colded down and we set off again and the car was wonderful again for about 50 miles and then the issue started.
We got to our destination at night time and I took the car this morning and no issues either but I imagine that they will start if I go for a long drive.
Any ideas thoughts ? I'm not very worried as I guess I can drive back to UK but I'm very upset as I can't find the fault.
Any advice will be more than appreciated.

I apologise for this long paragraph but even in holidays she doesn't let me have a rest
Thanks a lot

id change the air bleed valve and injector o rings and washers if not done recently

Have you looked at the wastegate modulator?

Checked fuel flow rate?

Do you have diagnostics, can you see if the manifold inlet pressure is too high?

Cheers

+1.... you need a tester to diagnose this directly and not work in vain cos there can be many reasons for that

btw, is it manual or auto?

and did you clean the MAP sensor after the EGR delete? ...also if you changed the injector loom due to oil ingress at the red plug you have to keep cleaning it with spray once a week untill all the oil leaves the harness

What sort of pump did you put in there dude?

Thank you very much for all your help and advice, I'll follow all of them.

It's a manual gearbox.
I didn't know a map sensor clean was needed after blanking.

Discodevon said:

What sort of pump did you put in there dude?

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It's a vdo pump so in theory is a quality one.

Sorry for answering telegraph style as it's been a busy weekend due to a wedding
Thanks everyone!

Small update after my holiday and coming back home with some more spare time.
I spray some wd40 into the turbo wastegate as I noticed that was really sticked. I went for a drive this morning and apparently in uphills the car doesn't loose power, I don't know if goes 100% well but first feelings are alright

Then clean the MAP sensor too

sierrafery said:

Then clean the MAP sensor too

Click to expand...

Best way to do it? Brake cleaner will dο?

Michalis Karatzis said:

Best way to do it? Brake cleaner will dο?

Click to expand...

Yes

Concentrate that the small hole at the base of the probe to be clear of muck cos there is the pressure reading element