My 2004 with 175K miles vibrates on acceleration, too. It feels like a tire moderately out of balance. It's smooth on cruise and decel. Another XC70 oddity to chase down.
BTW, My bang/rattle in the middle of the dash when hitting bumps turned out to be sway bar end links, a $50 fix for Moogs. I had previously spent $700 for parts to replace all 5 motor mounts chasing the problem, that didn't help a thing.
'04 XC70, Ice White, Taupe. Original owner (196K miles as of may21). 6 wheel bearings, broken ignition switch, broken turbo downtube flange, failed throttle body, many warped rotors, and a myriad of weird crap. Still my favorite car ever.
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