What would cause an intermittent vibration on 1997 Toyota Avalon?
on 1997 Toyota Avalon

Put new tires on the car, shortly afterwards there was an intermittent vibration, had the tires checked, supposedly they are all good.

Asked by for the 1997 Toyota Avalon
When does the vib. occur? When braking, accel., decel, pulling a hill, 65mph.?
Once a day? Once every drive? Steering wheel shake? Whole car shake? More info.