set it back and drive it for a few temps cycles.
After everything you've been through, I suggest you check base timing and set idle. You could fix this issue right then, or Do this.... set it to .45v let the temp reach 80 deg C, drive maybe 10mins, your idle should be found and stable but probably too low, if the screw is all the way down. move it up to stop the stalling.
When I fix this issue, I use temps, but you could use time if you can't control the engine fan
The IACV screw should never be all the way up or down. when everything is set and working properly.
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