My lean-burn issues seemed to be traced back to faulty (re-)wiring by the previous owner, although the code said O2, along with a few others. You can use a wire to jumper across the 2 prongs in the green terminal hanging under dash by the pass. door to see what the codes are.
Check your connections under the hood along the right pass. fender. Maybe plug & unplug each one a few times to clean up terminals. Then check the wires leading to the ECU by the pass. door pillar (under the dash) for any ghetto re-wiring.
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