Ok thanks! When I get the seal I'll try again. I never did try the regulator screw turned above being flush, but I spent a lot of time with it at the flush position...always surging. I'm at 4000'msl in AZ with outside temps above 70 degrees. So I would expect I would have to lean from the normal settings, however, as you say the surging indicates too lean, so hopefully the seal was the problem.....unless I tore it getting it out. Time will tell.