Glad you got this worked out. There should be a gasket between the secondary feed tube and the baffleFinally got to the bottom of my probation. It wasn't wet wood or soot built up in the chimney. I have a whirley on top of my chimney instead of a cap, and I didn't know but our chimney sweep guy said it was stuck. Air wasn't getting down the flue. So we added 2 feet of pipe and put on a cap, and now it's going great again. Thanks for all your help. By the way I don't have a gasket over my air flow tube, is this a big deal?