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ill let you guys in on a secret.......if you DONT have a wideband 02 then i would LEAVE your AFC settings at 0 or look out for trouble. stock 02 sensors are not made to accurately read your AFR's and if you think some lil autometer A/F gauge is reading right think again...they can be as inaccurate as 30% which is more than enough to blow up the car. I speak from expierence when i say put the thing on a dyno to tune it and DO NOT TRY TO DO IT YOURSELF WITHOUT A WIDEBAND! just wanted to add that...thanks