Flat up shift is initiated with a switch on the shift linkage.
The AEM ecu has 3 options: 1. ignition retard and fuel cut 2. ignition retard and spark cut 3. ignition retard and spark cut and fuel cut
Also, retard can be ramped up after cut.
So the question is how to program?
I'd like to leave fuel alone to prevent lean problems.
So, how long to cut spark, how much to retard, and how long to ramp up retard?