When looking at your VE table, the area where your vacuum and RPM meet is your current BIN. Idle bins are where it sits when at idle. Adjusting the number up or done affects the pulse width of the fuel injectors, and therefore making the mixture richer or leaner.

If you have not already, read:

http://www.megamanual.com/ms2/

http://www.msextra.com/doc/ms2extra/MS2-Extra_Neon.htm

http://www.msextra.com/doc/ms2extra/index.html

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2012 2500HD LML