Re: ef3000iSEB: fluctuating engine speed in economy mode w/no load

Update.  I disassembled the carb...again and cleaned thoroughly.  Main and pilot jets were removed and cleaned with carb cleaner and verified to be clear.  I also adjusted the valves, (which were loose), installed a new properly gapped plug, a new throttle control motor, filter and fresh fuel.  It still fluctuates engine speed, and does so in both non-economy and economy modes.  You can watch the throttle control motor moving back and forth so what ever the root cause, it's manifesting at the throttle control motor.  In following the service manual troubleshooting flow diagram, my next step is to check the valve face and seats.  I've got the cylinder head removed and valves pulled out.  Although the exhaust side is fairly carboned up, nothing looks too bad.  I'll be measuring everything closely against spec with my verier calipers.  Any feedback would be appreciated.  The last step in this troubleshooting process is replacement of the control board, which is in the neighborhood of $700!!!  I don't want to do that.