The tune is stock for now matt. And ya it bounces like that quickly and I'm using autotap to do my logging. As for the tsat, like I said stock tune so the fans don't kick on till 210 or something like that. So the o2s are supposed to bounce back and forth like that then? The wierd thing is that I don't have a cat on my car but it doesn't throw a code for running rich. Also could I be having this problem cuz I removed the egr and havnt had it tuned yet?