1). What wheels/tires are on the tC? A larger tire (17"+) with a low profile and wide contact patch will cause a car to pull and twist over uneven road surfaces. Road contouring is a definite problem for the big wheel crowd.
2) The bucking/hesitation is a product of the drive-by-wire (DBW) system and is very annoying. There is really nothing you can do about that.
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