Richard, I think that perhaps you throttle buterfly was just hanging up a little and allowing air to pass hence the slight level of rev hang. yYour clean up obviousely did the trick though! I remember being told that the plastic bodied throttle bodies were not to be lubricated as that can attract dirt and could swell the plastic. I never found that to be the case and clean with a light lube I feel is the way to go!
