Hey IndyHysterGuy...Sorry for the late response. I did finally get this unit figured out. The diaphragm in the fuel mixer has a like plastic material inside the part that glides on the center post on the mixer. The mixer center post also has a plastic guide on it. There were contaminants on the two plastic parts which would prevent smooth operation between them from time to time. This is what was causing the sporadic issue. I removed the top of the mixer (I know it says its a non-serviceable item) and replaced the diaphragm, cleaned the center post inside the carb with some brake cleaner and a Q tip and reassembled it. So far the unit runs great! I am certain this problem will not soon leave my memory. I just hope it helps someone down the road.