ive spent hours of research on this and here is something i stumbled on the other day.
before i go into that id like to say i have unplugged my maf and also cleaned it and same issue...
i have also put it into steptronic mode to find its not as noticable but after a while it stutters again!

here is the head scratcher...
so we all know fuel air and spark makes pistons and engines fire.
so i tried cheap gas and yes i had alot more stuttering and rpm jumps.
this now makes me wonder if my coil packs are just not as sparky.

other than that my transmission also shows no sign of gear issues.
and if its the tranny im sure its the valve body.
these trannys are infamous for valve body issues where the dealer will burn you and swap the whole thing this coming from my long time bmw mechanic buddy who quit being a mechanic but has all his m cards and german training 13 year bmw mechanic back in boston im in fl now so i cant use him...

so valve body / filter / gasket / fluid
about 600.00 do it yourself in an hour and there is a great video on you tube.
also if you drain your tranny ive heard thru the grape vine you should not drain it completely that the aluminum that has disolved into fluid creates a bond between your gear rings thats why bmw says dont change your fluid.
just change whats in the pan.

this is a head scratcher and in a few weeks my car will go into dealership i have an 03 4.4 and i know there are 2 tranny updates i need ill repost what the dealer diagnoses.

i was positive it was the valve body but after the cheap gas technic im wondering if it is intake cam sensor / coil packs.

i have a new fuel filter so i know fuel is getting there clean, new plugs also injectors have been cleaned and tested. its either air or spark and im betting spark. although that would show a misfire code pretty quickly...again stumped!
any input would be great. sorry for the long post.
130k on it btw