i posted go lean, i droped from 76 to75 secondary, 72 to70 primary, didnt have a 71, so be it. now im up against 4 corner idle adj. any rule of thumb on 4 corner adj. as far as rear throttle blade adj. ithink maybe i have something out of whack in that area not letting me get my idle ieaned down like it should be, it is nasty rich and wont lean down without causing a rough idle.