the front engine cradle bushing may have rotted out cause what you are saying is how mine felt. it is like wind wonder like on a non windy day you get a little wonder left and right. could also be torque steer or bump steer whcih is cause by caster or camber. any ways hope this info helps. crawl underneath and look at the front subframe bushings see if they rooted/rusted out around the bolts that attach it to the unibody. if they are that is your problem if not check in to the caster camber being off.