the engine is blowing black smoke out exaust
if its just doing it under a strain or under pulling id try running some injection cleaner through it first then see what happens,dirty injectors will cause that too happen on those,if its not hesitating or dieing out on you its probably just dirty injectors
Troubleshooting and repairing/replacing a bad injector on a Cummins N14 Celect Plus diesel engine.
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