Freelander TDI SE acceleration problems

Hi, I wonder if anybody could help! For the last couple of days my landrover freelander wont go over 3000 revs in any gear! It kind of gets to about 2500 revs and starts to very slowly creep up to 3000. This is meaning that I get to drive very slowly and not overtake anybody! I took it into the garage and they didn't have the faintest, they took a valve ofand gave it a good clean but with no joy! Any ideas?? Thanks!

do a search for power loss - this crops up regularly...

Check for split Turbo intake hose, it runs over front of engine.