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on a downhill descent that isnt a single level grade (ie a rocky downgrade) there is a magic point where it cuts between idle up and over run
if you happen to jag it so that its trying to do one then the other due to changing vehicle speed over obstacles on the way down (like that double drop at the top of the line you took into gunshot but worse) and the track is consistantly rough in the right way all the way down you wind up bunny hopping it down.
Ive experienced it but then I was out to do it deliberately and had stacked the deck against the vehicle to make it happen to see if it would. you can also make it happen on the way up a hill if you're in the situation where the high idle isnt giving you enough but you need to slow right down (a torn up shale climb for example) but its nowhere near as noticable...
there are of course very simple ways to get around these problems outside of just turning the damn thing off but you cant just turn it off.