[G-shock12]

Hello, Im new to the forum.

Purchased a CPO 328i xdrive with 35k miles a few weeks ago. I've been noticing a bit of lag and a very loud low frequency Shudder/Vibration/Bogging when lightly accelerating up to 1500rpm. It almost sounds like bass from a subwoofer and resonates throughout the car. This happens before and after the engine is warm and even in high/low gears.

It is most noticeable in traffic while on comfort mode, but can be reproduced in Sport mode as well.

Is this this a normal characteristic of the n20 engine or 8 speed transmission?

Also a couple days after purchasing the car, i brought it to the dealership to fix a rear deck rattle. While it was in the shop, they gave me new x1 as a loaner. i did notice a slight shudder with that car, but it wasn't nearly as loud or noticeable.

A couple things i have tried:
1. Transmission reset - (holding gas pedal for 30 secs, shut off car) Did not really notice any difference

2. Had someone code 2TB SAT - No difference in shudder and no noticeable difference in speed or firmness of shifts

Sorry for the long post. Any help or advice is greatly appreciated. Thanks!

[G-shock12]

Not sure if i posted this in the wrong section. Any help would be appreciated