I have a 2015 2500HD with a gas 6.0 (L96) and have a stock ported 87mm TB on it.

Runs fine, but this truck has a torque based ECU, no airflow tables at all. The only issue I have is a cold start RPM flare that settles down immediately. Basically, it starts normally and instead of revving to 1500 it revs to 2000 and then comes down.

Anyone knows how to correct this without affecting the rest of the tune?