What smracer posted is what I'm talking about. It's a bear to find until it happens once, something I check regularly now. Dishsoap, if I were you I'd look at the fuel clunk. Then I'd set my idle gap properly and leave it alone. Put the engine back to factory settings, then get the top end where it's running pretty well. Then adjust the low. One other thing I haven't seen mentioned is to check your linkage. Be sure that the barrel is fully closed at idle and doesn't close up any more when you hit the brakes.