Another update. This is getting very frustrating. The shudder has come back full bore like it was. For two days it was improving to the point of it not even being there. As of today, with no changes whatsoever to anything, including gas, the shudder is back. I don't get how the same car, with the same driving conditions and fuel can change over night like this. My head is going to explode.

I'm thinking maybe this issue is more engine / electrical related now because when this happens, if I press the gas the RPMs drop by about 200rpm and the engine bogs down and the whole car shudders! Then I press a little more and the car snaps to life and accelerated quickly. This is very concerning for traffic conditions since I will be essentially driving up on bumpers and slamming the brakes constantly because of this bogging down and shudder.

Any ideas?

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2008 X5 3.0si
256k Strong