Its funny you say that.... I have never had any experience with six pack set ups prior to my challenger.. i didnt think that much of the idle circuit is actually ran off the outboards... Boy was I wrong... I was messing with the center carb all day trying to get the stumble out... as soon as I was able to play with the front carb, I noticed a night and day difference! I'm excited to tinker with it a bit more and get it where it needs to be....