Hey Guys,
I was working my VE/autotune the other night and everything was cool until my third flash of the evening:

The truck is surges really bad at idle now. The timing oscillates, and so does the afr. It seems to drive ok, but when I slow down to stop it dies. It also dies switching from Park to Drive or Reverse.

What could I have messed up? Is there something mechanical that could be wrong? I hate to start changing stuff in the tune when all was doing was working on the VE table.

Running SD Cust OS 3. Fuel pressure good and no logged misfires.