I have read a few things and watched some videos on this subject and one think I got out of it is to not move the butterfly by hand. Is that just referring to while it is still attached? If you remove the throttle body, do you need to worry about it? I imagine removing it is probably the way to go to get a good cleaning too if it has never been cleaned, right? I have a 2000 5.3 with 145k miles .