Hello, I'm resurrecting my 84 4Runner 22RE that has been sitting for a while with the hood off and I have an idea for adjusting the Air Flow Meter that I want to run by you and see what you think. First off, I've researched this procedure for a while now and have been making small adjustments to see the result, however, the results seem inconsistent. I have found the range of "clicks" on the wheel that are too rich and too lean and have been working within that range, but after I make an adjustment for best performance (probably on the rich side) it will run sluggish and backfire the next time I turn it on. I want a systematic way to measure and adjust air/fuel mixture, and since that is what the ECU does in closed loop, my idea is to adjust the AFM based on the O2 sensor with the ECU in open loop. My thought is to measure voltage at the O2 sensor plug (disconnected) and turn the wheel in the AFM until I get about 0.6 volts at idle (750 RPM or so). Additionally, to make sure it stays in open loop I would simply unplug the Engine Coolant Temperature sensor. Am I missing anything?

Additional info you might want to know:
I have a 1 wire O2 sensor.
My AFM door was stuck closed so I opened it up to clean and lube it...I lost the factory setting.
This is an off road only rig "trailer queen" that never comes out of low range so I don't need perfect tuning, just something I can check reliably and repeatably.
I have a new and correctly adjusted Throttle Position Sensor.
I have a new fuel tank and filter.
Fuel pump works fine.
I have cleaned the injectors and tested their spray pattern.