I don't know why it's running lean, either, but what if you screw with the MAF by wiring a small resistor in parallel with its sensor circuit?
The other thing I noticed is:
Quote:
Exhaust Manifold (Dorman 674-545)
Cat Converter (Dorman 674-545)
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These things are built much more cheaply than the original ones.
I'd scrutinize the cat and the EGR, since both of those have been giving you problems and are there to reduce NOx.