Sounds like Limp.
Did u recently block the EGR?
Fit the Dawes and needle valve and for stock ECM(ecu) set the max boost no more than 16psi hauling (going up steep hill) in 3rd gear. For CRD using manual boost control, u need to have the vacuum solenoid plugged into its elec harness.
As said above, is a good idea to fit a scan tool and see if any trouble/fault codes are reported.
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