You.d be better off restricting the IFRs/IABs to where you have a good adj. on the mix screws, Also see what the PVCRs are at, If you have it where you want it at idle/light cruise & the mix screws are at least 1.1/2 turns out this should be close, The problem may be in the transition, this is the area of the PVCRs, you can hook up a vacuum gauge & see how the vacuum drops in conjunction with the wideband readings, if its getting richer (in your case too rich) as the vacuum drops slighly as the PV starts opening, i'd restrict the PVCRs around .002"-.003", this should lean it out, then jack with the jets for WOT AFR. where you want it. You can tap/thread & install screw-in bleeds on any carb, you just need the pin drills & bleeds, still cheaper then a new carb.
Last edited by joedust451; 07/08/11 01:02 AM.