You have a air/fuel meter? Why do you think the afm is reading wrong?
Without knowing what your air fuel ratio is you really can't adjust it. I've read to just buy another one. I bought 3 from a junkyard for 5 bucks a peice.
1999 540i M-Sport
Still fresh and Minty
Black on Black coupe 5spd
1979 Trans Am 10th Anniversary
#16 of 5,683 made
KOI Import Parts-- 513-771-7777