I only noticed the problem immediately after I wrapped the pipes. I have no airbox, just K&N filters. My first thought is that it is a coincidence. I replaced the copper gaskets when I put the pipes back on and snugged them down very well with blue loctite. I'm going to fiddle with the A/F screws and see if that doesn't made a difference. I just wanted to get some other people's opinions before I started tinkering on it to make sure there isn't something else I might be overlooking.