Hi guys, if I sit on motorway at say 50 mph the revs fluctuate slightly, it also, upon gently throttle, seem tobe a bit under powered but if you need it to fly it will seems a strange one I know. Done 159k well looked after and serviced regular. Took it to an Indy and he gave me a list of faults 6 glow plugs and 2 thermostats were the main issues as he thought it was a dpf fault, back pressure was a lot higher I think. Any help appreciated cheers De