At idle, when I apply throttle quickly, the engine sags noticeably. It doesn`t sputter and burble like you ordinarily associate with a rich low end, it justs sags, sometimes to the point of cutting out. I`ve been working from the assumption that it`s loading up at idle because when I run it at open throttle ( runs fine )and cut it back, and then quickly open the throttle again, it transitions fine. Maybe my assumption`s off base (?). I`ve been leaning out the low end, but so far without much improvement ( some though ). Any thoughts would be appreciated. Maybe I just haven`t hit the sweet spot on the low end? Thanks.