What do you mean you cleaned the injector? That is pretty much a job for a diesel shop. They test it to see the spray pattern and rebuild as needed.
You can bypass your fuel tank and just run your fuel hose into a jug with clean diesel.
Exhaust could be plugged. Does water pump out of the exhaust while you are spinning it over? Then probably ok.
Keep at it. I suspect you will get it figured out.
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Currently in Long Beach, CA