Strange issue with my 05 freelander td4 facelift

Hi everyone,
Hope someone can help, about 2 weeks ago I got an 05 freelander td4 facelift with 122k on the clock, my first issue was getting engine check on as soon I get close to 2500rpm and drops performance, these are the parts I changed so far, LP fuel pump, Fuel filter, MAF sensor, also changed the sensor on the air intake, changed turbo solenoid, all 3 vacuum pipes that attach to the solenoid, also changed hoses from turbo to intercooler, crankcase filter, oil filter and oil change, now the car drives fine when engine is still cold then as soon you drive 4 to 5 km I get a complete sudden power reduction where engine goes back to idle and nothing happens when I press the acceleration pedal engine does not rev, sometimes when it happens i keep the pedal floored while parked on the side of the road then all of a sudden I get throttle response, sometimes even turning off the car and start again fix the issue but only for a moment then it starts again, I also cleaned the egr, all the connectors from injectors, camshaft sensor, high pressure fuel sensor, before the problem starts the engine sounds and feels good but just before the problems pops up gain I can notice the engine starts to become a bit rough with some misfires at around 2000 and 2200rpm.
The only other things I can think off that could cause something like this are the HP FUEL PUMP, injectors or wire harness, faulty camshaft sensor, clogged fuel rail, faulty high pressure fuel sensor or could also be bad or clogged turbo.
Hope someone has a solution or some tips cause I ran out of ideas and this fix is starting to become expensive. I did have it plugged to a computer and the only fault that came up was related to the sensor that is attached on the air intake I got a new replacement but still was getting same fault

Closely inspect the connector and wiring to the rail pressure sensor for corrosion. Try wiggling it to get the fault to occur.

HP pump regulator O ring also a possibility.

Can you get live data to check accelerator pedal readings?

what was the fault code, and can you check live data from accelerator paedal?

If it's not responding to the throttle pedal, then it would point to the throttle position sensor. It's best to put a diagnostic device on it and see if the throttle pot response to the pedal input.

Update..... so today I decided to take my car to my mechanic to see what els we can do and he decided to start the car and just rev it up to 3000rpm and left it revved for about 10 minutes continuous, you can feel some type of misfire passed 2,100rpm but oh boy that 10 minute revved at 3000rpm made a huge difference, no more complete sudden engine cuts but still shakes like crazy I can feel the misfire trough the floor, pedals, steering wheele, gear stick.
Have few things in mind that might be holding the engine from working smooth as it should,
Dirty injectors, lp fuel pump if not spinning fast enough to supply the demand of fuel the engine requires ( LP fuel pump was replaced a few days ago and also the fuel filter, would connecting the fuel filter the wrong way by mistake cause such issues ? Could it be just carbon buildup ?

Also noticed that on 4th gear it hardly manages to go past 2000rpm and starts, I think when the engine reaches 2000rpm on 4th gear the fuel pump seems not to manage to supply the required fuel the engine needs to operate smoothly.

idouglas said:

you can feel some type of misfire passed 2,100rpm

Click to expand...

That's pretty normal.