Cleaning my throttle body -- question(s)

[KMeloney]

Engine bucking, or brake peddle/steering wheel bucking? Additionally, have you tried running a fuel injector cleaner? If not, I recommend Marvel Mystery Oil. 8oz. of that with 20gal. of gas will start to help things out.

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It feels like a total vehicle bucking, maybe through the transmission. It's not a harsh, slamming feel. It's a slight back-and-forth sensation. The dealer ran a complete fuel system cleaning process, but there's no change in the bucking sensation. I don't feel any bucking through the steering wheel -- what I feel is a slight "chug-chug" (maybe just two, like I just described) upon deceleration, like there's slack in the drivetrain that floats in limbo until the slack is taken up. I know... Getting a little nebulous here, but I'm not sure how else to describe it...