You put on a new derv filter??
All boost pipes connected OK and no pin holes.
Bleed off pipes OK, no leaks from the injectors. Get someone to rev it up with the cover off, sometimes you get a bit of derv blowing by the copper seal. You had the injectors out??
Might be worth cleaning up the air intake bit that sits on top of the engine.
I'd change the derv filter first, what about the air filter, that been changed???
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