idle flutter, TC stutter, feels like Torque Converter jumping in/out

[rijrunr]

I have a 2014 Silverado 6.2. Max Trailer package. I recently took it in for scheduled recall. It has about 10,500 miles. I could tell they did something with the TC, grade braking and also the adjustable pedal settings. My truck started to act strange with idle fluttering and it feels like the TC is jumping in and out, like it's trying to decide whether to lock or unlock. It does this at speeds below 50 MPH. I am wondering if anyone else has had this issue and how they were able to fix it? I talked to another owner that had this issue and he took it in multiple times to have the dealer find nothing... He finally tuned it; modifying the TC adapt settings. I am very hesitant to void my warranty considering the issues with new new style.

[MikeNH]

If there was a reflash as part of the recall the TCM may have been reset. How long ago was the recall done? If it was in the past few days I'd drive it and don't be afraid to get on it hard to get the transmission to re-learn shifting characteristics.