asuming no air leaks in fuel,poss leaking EGR valve, i would also get the engine hot and fill the diesel filter with injector cleaner, start back up and allow to tick over for 40 secs and switch off. leave overnight, put 2nd bottle of cleaner in tank and run around for a few days.
I used to come across quite a few pugs with simialr faults and often no more than gumed injectors
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