I had the same issue with my 4L60E. It would hang in third gear when coming to a stop. Only did it when engine was fully warmed on the highway for five minutes or more. Engine would not stall because the torque converter worked like it was supposed to, just very sluggish out of the hole.


Never did figure out exactly what it was but went to a much earlier tune and copied over the shift tables. I am running a 603 operating system, and will share the bin file if that will be helpful. Might be better to grab the stock file from your other computer since it is running the correct operating system.