I believe I have the same problem that TheWeatherman had in his FX35 in the first video of this thread:
7 A/T Question
The only problem is, when I got on the Z hard when it entered this low rev mode it crapped out on me (had to pull over, turn engine off and start it again)
Would a reflash help?
The jerking when coming to a stop seems to be par for the course (I have found other posts in this forum mentioning it).