To me chances are your intercooler is leaking, it will need replacing with a fully tigged one from say Diesel Smart.
Being a 3ltr dont go the big IC not worth it on such a small motor, read up on NADS and have a talk to @mudski
about setting up some gauges boost, egt. and a Dawes and needle valve. You need all this to "see whats going on under the Bonnet"
You could even fit a larger bonnet scoop to allow a bit more air in, You could be losing boost egts getting high ETC. You need to thow
some dollars at it to set it up correctely
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