I would rotate your wheels and re-balance them. Could also be a lose steering component- front track-bar, lose draglink, or tie-rod. Possibly worn out hub-bearing(s) or ball-joints. Might be a lose control arm bolt as well.
Personally I would check the wheels first- balancing, alignment, rotation, air pressure......
then I would check the torque on the front track-bar (125-130 ft lbs).
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