It could be one of two things the first and most likely is the allignment.The second is the front springs could be worn.I can´t remember the relative terms (camber,caster,toe in toe out plowing or pushing) I would get it checked at an allignment shop but first check the acceptable settings in your manual so you have something to compare against what the allignment shop tells you.I had mine checked on my 94 and they said it was ok but I compared the printout to the specs and it was about 5 degrees out of the acceptable setting for toe in causing wear on the out side.Of course I am pretty hard on tires because of the way I drive so I got it realligned before I put on new tires.