2014 Chevy SS - Magnuson Supercharged - Hard braking engine turns off

[ip-alpha]

I have never encountered an issue like this before. The car is a 2014 Chevy SS with a Magnuson supercharger, 60lb fuel injectors, headers, high flow cats and exhaust. Other than that it is stock.

Before I tuned the car. The tcm bricked during a flash. Towed the car to Chevy. They replaced the tcm. Since then I have not attempted a tcm reflash.

I'm using HPT Beta 2.25.1199. Car starts, idles, drives and boosts awesome! LTFT are +/-4%. I have tried idling it from 625rpm - 825rpm. I have tried increasing the Airflow Final Minimum, Throttle Follower Torque, Spark Minimum and just about everything else every which way.

Now onto the issue. When I brake hard to very hard the rpm falls very quick and the engine turns off. I got it to a point where it would only turn off while driving the first 30 seconds but in drive off throttle the car would want to drive forward.

I bounced ideas off two other guys who tune HPT on a daily basis. Nothing.

Any thoughts, ideas, insight are much appreciated.

[BigDaddyCool]

Slow down the follower rates ?

[ip-alpha]

Slow down the follower rates ?

Tried that as well. It seems like the throttle closes and never comes back.

[ip-alpha]

I left the idle at 835rpm. 9 out of 10 times it doesn't stall now. Never had to work so hard to get a stock cam auto car to idle decent, lol. Oddly, this is what I ended up with among some other things with the ignition timing. Rock solid idle now.

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