My 2002 4.4 does EXACTLY what the op posted. I am going in today (for the third time) to get this resolved.

Here is my theory. ......

We all understand why wheels need balanced. And we all understand when they are not, they can get shakey, jerky, vibrate, (what ever yiu wanna call it) ONLY AT CERTIN SPEEDS.
This is called "harmonic balance" the natural vibrations of an object spinning. NOW, our motors spin, and also have this same issue. At some rpm's our motor is very "harmonically balanced" and at other rpm's..... not so much.

I believe that if the motor mounts were worn out, loose, ext... That this could give us this "shake" at a certin rpm.

Two reasons. Those of use who have this issue... It's IDENTICAL to one another.
PLUS have you notice that when this issue is happening, you can REV right past it? Typicly when a motor is running rough, and you add throttle, the motor struggles to "REV out of it".

With this issue, I can REV out at any speed, slowly, quick or what ever.

I will be with the Teck when my ride is up on the lift. This problem is over TODAY!!!!!!

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Pro motocrosser since 2005. First time BMW owner.
2002 4.4 E53