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FWIW: Many of these engines were designed for higher lubricity fuel that ULSD doesn't provide, so adding something similar to Optilube (pick a flavor) to the fuel will help the engine long term. For short term use, B20 has great lubricity properties, and I think that SeaFoam is great at...

Since you just worked the engine over, that does sound a bit odd, but I don't know exactly what the cause could be. That sounds like some amount of stiction (friction) on a cold injector rack. Sometimes when I get an engine that seems to be "sticky", I will put some Tuff-oil in. Yes, I know...