I've talked pretty extensively with engineers at ZF and weak coil packs can produce a similar effect, especially if there's some load on the engine. However, in cruise control and Sport mode the throttle does not miss a beat. So it's hard to see the coil pack thing. Let us know what you find with the software. My X5 is getting ready for a new trans at 143k. Same thing though, my trans feels great - hard to justify. I know my TC is going and might as well do the trans while it's out. Out of warranty obviously so no stealership work.