> Another thing to keep in mind re: injectors or O2 sensor, the O2 sensor is
> not used by the ECU at idle.  This is why the CO adjustment on the AFM is
> used.

No, the ECU does use the O2 sensor at idle.  If you have one of
Ken Lewis's little gizmos, you'd know that it dances up and
down at idle--maybe slower than at high rpm, but still....

http://neksiwel.20m.com/photo5.html

I'd say the CO adjustment is to get the range "in the ballpark"
so the ECU/O2 can manage it, but others might say it better.

Richard