Idle has NOTHING to do w/jetting or p/v`s unless they`re blown or the gasket is leaking. Ifr`s, t-slot restrictors and idle bleeds are your friends here and until I addressed those areas, I was rich at idle and lean at wot due to 37 hsb`s and a small .139 angle channel............ I guess my point is that most focus on wfo when the lower range of the carb needs just as much attention if not more. Just go to the bullet and read the many "car won`t idle, plugs foul gettin in and out of the trailer" posts..................