Post Master General
Join Date: Apr 2012
Location: Bowling Green, VA
I Ride: '09 ZX6R
The knob on the cable by your left knee when you sit on the bike adjusts idle speed. Clockwise direction for faster, the other way to lower the idle speed.
You could try raising the idle a bit, and see if that improves the condition.
The updated ECU is likely the best fix, but I would personally do a tune up first. Plugs, air filter, valve clearances inspected,possibly synchronize the throttle bodies.... Get it running as right as you can, then evaluate. If it still bothers you, THEN buy the updated ECU.
"Basic stuff fellas. Use your head for something other than to break your next fall." Words to live by