[DieselDoctor]

Try putting the governor spring back into the hole it was originally in before this problem started. Regardless of what the book says as to number of holes, the holes in the arm are there to be able to adjust gov sensitivity. Basically more or less initial tension on the spring. Question - how worn are the throttle shaft bushings in the carb? If there is a lot of wear, so that the shaft is loose, you probably won't get a good steady idle until it is rebuilt or replaced. The gov expects the carb to respond but it has to take up all the slop first. A loose shaft can also be vacuum leak on some carbs, which effects mixture adjustments.