Check your entire front suspension for any extra wiggle, including all joints and connections. Check wheel/tire balance using a dynamic balancer...if too much weight needs to be added, remove the tire and reposition it on the rim. Do the check with the front end unloaded. Also, have the alignment checked and adjusted.
It would also help to know if any non factory mods have been made such as tires, wheels, spacers, shocks, springs, lift, etc.