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2018 Volvo S90 — light-throttle shudder around 35–45 mph — anyone dealt with this recently?

RoadTripBuyer172Community StarterJun 7, 20262018 Volvo S90 T6Miami
2018 Volvo S90 T6, about 66,000 miles. There is a rumble-strip-like shudder at steady light throttle in a narrow speed range. Harder acceleration or lifting off makes it disappear. How would you separate converter behavior from engine misfire or wheel/tire vibration? Mostly looking for the right next step.
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