Ok, this is a strange one. Car is as per sig. From a standing start all is ok, there is the slight delay and a bit of turbo lag until about 1200rpm as characteristic of this car but it's normal and has been like this since new. However, once on the move, all is not well. I can be pootling along in say 3rd, and when I give a bit of gas, it's like the engine has fallen asleep. The is no power and the revs slowly climb until about 3000rpm when all the torque and power slams in and the car rockets forward. Does this sound like a sticky EGR valve? The only way to get almost instant acceleration is by kick-down so that the revs are above 3000rpm. It feels like the turbo is not active below 3000rpm when is suddenly becomes full on. My car used to be very smooth, with a nice smooth build-up of power from about 1200rpm, but now the power is very aggresive and only from above 3000rpm. I only use shell v-power diesel btw. Any help would be most welcome.