Your questions are way above my pay grade. However, many inline sixes were made with NO idle stabilizer and were fine. There are a lot of reasons they won’t idle smoothly and reliably, like flooding carbs or the loss of compression or spark on one cylinder. The biggest thing, by FAR though, is also the simplest to fix. All three carb throttle plates have to crack open at the EXACT same time. Over time, the plastic links between the carbs grow weak, which results in progressive throttle lag between the top, middle and bottom carbs. You can readjust the links to correct for this. I don’t know how many times I did this simple adjustment and made a lousy-running engine run like new.
Long live American manufacturing!
