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Here is nutshell SOP
1. Install all OEM parts including IACV
2. compression test, boost leak test, tune up: oil/filters/clean the maf/ clean the inlet (wash all plumbing thorough with degreaser and water) wipe everything completely dry before using it again.
3. Disconnect the narrowband oxygen sensor and drive the car. Does it drive normal? You do not need to boost the engine to drive the car normal.
4. Once you see whether the narrowband was fooling the ECU you can replace the O2 sensor, or start changing other parts i.e. maf/ecu/regulator/fuel pump with the fuel pump being next on the list for sudden lean issues besides narrowbands.
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