Also just dawned on me how are you running lean? If you have a MIL on then you should be on open loop and running rich, what lead you to think you were lean?
What do you have in there for 02 sensors? Some of the aftermarket ones are just junk.
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5.3L LSx, Fbody .500 cam, TH400, 4500 Stall, Moser 9"
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