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I noticed in other 411 tunes, there is a B4206 which is an enable/disable for o2 correction in open loop.
This is no longer available/shown in COS5, although I had it disabled previously in my base...

It is fine in open loop & also fine in closed loop, it just has an issue during the transition.

I am having an issue with the vehicle initially going lean in closed loop.
This is an LSA supercharged 6.2 in my S10 with the factory 411 PCM.

Upon initial start the air fuel is 11.5 which tapers...

2-3% is nothing to worry about in modified vehicles.
If you are over 5% consistently, I would investigate, but random variations can be common at idle especially with larger cams.

o2 sensor...

Have you swapped the o2 sensors to see if the trims move with the sensor?

Are you running single or dual exhaust?

Are the trims consistent all the way across the table or only at cruise?
...

Your stall saver rpm is set to 800 across the board..

It should be typically 100-150 rpm below the desired speed.
This makes it kick in at 800 when you only want 650.

Not sure of the overall...

Great, thanks.

I was worried as the menus were not there previously & my 1221256 doesn't have DBW throttle but there is data in these areas.
I didn't want to corrupt my tune.

I just installed EFI Live on a new laptop & it has additional menus coming up that are not on the old one.

Tuning a LS1B COS5 & it has menus at the bottom of the Engine Calibration list for...