Idle/coastdown control in 2006 OS

[superls1]

I have had success managing RPM fluctations when coasting or coming to a stop (approaching and leaving idle) in older OS's with Throttle Cracker/Follower tables. However, new OS's like 2006 GTO do not have these tables. I have an intermittent (can't always duplicate, but hasn't gone away) dip in RPM's in a 2006 GTO (6sp) when approaching a stop sometimes. Just looking for a little better strategy and suggestions. This is a H/C 402. Thanks.

[EC_Tune]

Take a look at your airflow at idle. Then look over at the Base Running Airflow Airflow Final Minimum. Then make the two match.
Also increase the startup airflow for your 402. It will start much cleaner with about 2-3 g/sec added to that table.