Me too dude,
I have 900 + and just when I think Knok is 0 it shoots to 5. I could turn my fp to 20 and still have have high 02. I took my secondary fp offline and ran on the stock wired primary fp. Still have high 02s! A pit bull chip does this and so does my ramcharger-no diff whatsoever! My fp gauge agrees with my tool box diagnostic gauge. I am clueless. Maybe a Testa chip would be answer.