So this went away now that the intake is back on? I'd really have to see a video to understand. I think if I touch my brake pedal does the same thing on my w210s... I think it may be normal, it could just be the trans downshifting. I'd really have to see.. Try youtube upload and you can post the link on here.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k