I've got a Weber sitting in my shed, waiting on time for install - idle is just a screw against the butterfly linkage - are you maybe confusing the idle speed screw with the rich/lean screws? If you are talking about the screw on the side of the carb, where the throttle linkage is connected (where you can give the car gas by hand under the hood) turn it until you are happy with the idle, that's what it's there for. The linkage could be just a little bent, and need a little more screw in than normal. If they were all the same, wouldn't be a screw there! :) Tookie - Denham Springs, LA
88YJ, 4" lift, 33" TSLs, Lock-Rights PosiLock, 4.10s