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It got lean when you messed with the maf.
Mafs are cheap, go grab several KA24E mafs from anywhere and try them, one at a time, until you find one that gives the a/f you like.
Took me 3 tries to get mine. Some go stupid rich. Some stay lean. They are old...
Its easier to diagnose a lean issue than rich. Lean is very straightforward: you need more gas, which is directly driven by the maf at those pressure ratios.
and worst case scenario, you play with the fuel system (fuel pressure / pump / filter)
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