The throttle/tranny acceleration/surge/lag issue is not uncommon on MY '04+ 4.4's. The dealer will most likely reprogram the DME.

I never went into trans. failsafe mode, but did experience lurching, throttle lag, and surge. My service advisor was quite familiar with the problem, which was rectified when the DME was reprogrammed. Sorry, I can't provide you with a TSB or any other technical info.

Good luck getting that resolved.