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What you say about the intermittent problem not being intermittent makes sense.  The carbs are synced as I am using a gantry and I checked it.  The old carbs were also on the same gantry.  The gantry is a thing of beauty when working well.  It was running and idling well before the back firing started.  The back firing started before I was able to put a light on it.  Under current conditions, I cannot run it very long.  Stephen Kelly of Tri-Spark thinks the EI stator could be at fault since the test function is not working.  He has offered to test it. Thank you for your input, I appreciate it.  I really do dislike electrical problems.