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Ask for Robert at 888-687-0539. This is a Yanmar dealer in Baton Rouge, LA. He will need your engine's model number. https://www.dieselpartsdirect.com/yanmar-diesel-engines

If you're getting the same running condition with the known-good injector, this points to any of the other items mentioned. Just go through the check list, not necessarily in the order provided, maybe the easiest one first, such as intake obstruction, timing, valves...obviously we're all hoping...

I'm still learning about these engines myself, but can offer a few things to consider. 1. Check the fuel plunger on the injection pump as it may be sticking a little. I've only seen these fully stuck and they have to be freed up. Since your engine is running at lower speeds, this could be a...