Well I've been putting this Lucas Ethanol Treatment in and my air bleeds clogged up again yesterday. I spotted it pretty quickly, a change in off-idle performance, at first about 75-100 RPM drop at idle, then you have to heel-and-toe at the stoplights, then it won't hold an idle at all -- all of that in a matter of less than ten miles. Cleaning the air bleeds with carb cleaner and a plastic bag brought it back like a magic wand.