My disco 300 can be a bit slow off the mark but once it is going it goes like jo stink no matter what it is towing. But even doing 85 on the motorway & it reaches a long hill it will always die back to 50 every time nomatter what i try, foot to the floor or changing down gear. Also climbing sharpe hills with power on it goes great but if I let off then accelerate again it will not power up again.The turbo runs clean with no smoking. The turbo boost is definately missing, any ideas where to look please.
