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I'm betting your engine is fuel starved. Doesn't take much fuel to run an unloaded diesel; takes a lot more to run it hard under a load.
Your diesel mechanic will probably be able to fix it by fixing the injector pump, probably by adjusting it.

If it puts out black smoke when he finally gets it up to speed, that'll be excess fuel and he'll adjust it back down.

Blue smoke; oil. Black smoke; fuel.
 

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...........how would one adjust the amount of fuel on the injector pump. thanks guys.........
The procedure is detailed in the manual - not the operator's manual, the mechanics manual.
On my Yanmar it consisted of placing or removing shims within the injector assembly. Seems like injector timing and fuel amounts were adjusted the same way.....it'll take a mechanic either way.
 
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