Land Drover

The vehicle start to cut and after taking it to the dealers they still cannot get the problem. They put it on the computer but no problem. I even send it to retailers to check Bosch diesel pump, but there were no problems.

The vehicle hicup get "when the referees are more than 3000 and you do not change it for the next train, he cuts. When we finally get to fifth gear and start making your speed over 100 km hours, he begins to "hicup" more until you get over 120 km / h and then travel smoothly again. The moment you start losing speed yet, start doing it again.
I would appreciate if someone can give me an idea of what the problem may be.

I just checked the database ASE for other vehicles of this problem and none have been listed that have been diesel.
I can not tell you exactly what to look because he is British, and Canada. (?)
However, it must be OBD II compliant protocol (diagnosis), and as such, should allow "snap-shot" or "movie" in operation.
The technology connects the tool to analyze the DLC OBD II, and drove the vehicle. When the outage is known, it pulls the trigger "for the movie begins. He recorded several values of operational parameters necessary for thirty seconds.
Of the thirty seconds of the first fifteen are before the event occurred, and the last fifteen seconds are after the event.
Technology can now go back and compare all the values recorded before and after, and those he sees different standard, or violently outside the expected values can be studied and tested to failure.
If Land Rover is not willing to make this diagnosis, call around to locate a reputable repair facility that knows Land-Rover. Be sure to display the badge on his company ESA.
Discuss with him the cost of diagnostics and repairs, and be sure to tell him about your problems with the dealer.