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Finally fixed!
I don't know if this solution will help others but it sure resolved my frustration trying to discover what was causing my engine to miss. I checked for proper operation of the fuel injector thermostat, drained and renewed the oil in the fuel injection pump (it had been fuel diluted and overfull), changed the seals in the cold start valve, checked the fuel flow volume of the fuel pump, Changed the fuel filter element, removed and had the fuel tank boiled out and cleaned out the fuel tank filter. None of that help until I blew out the injectors and injector manifold. There were very fine elements of rust in the fuel filter and the injector blocks. I was never able to get the Injection pump air filter to eliminate its vacuum function when it was warmed up. It decreased to a very slight vacuum but the book says it should stop sucking vacuum completely when warmed up past 70 degrees. Regardless, it is now purring smoothly at all rpm ranges and stable at idle.
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