first things to try are change the air filter(at that milage it could well still have the original one in), change the fuel filter and try a good fuel conditioner/injector cleaner. I have used millers diesel powerplus in the past. try a double or triple dose for the first treatment then return to recomendation until bottle id finished.
Also try to drive harder more often, these engines like to do a bit of work and regular gentle short journeys don't help.
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