Any particular plane for this wobbling? Mostly up-and-down (bouncing), horizontally back-and-forth (fishtailing), or something more interesting?
Let someone drive your car, and follow behind it. Are the rear tires follwoning the front, or is there an offset ... is the car "dog tracking".It has just been fishtailing, no bouncing at all. It feels as if it pulls left then goes right and it stays like that until I slow down to about 55-60.