I had this on a Mack truck I drive, however it ended up being a U-bolt loose on the front axle. Can't really claim that for a Fiero haha.
I would wiggle your front tires and see if there is any looseness or play. Could be worn out front tie rod ends or bad wheel alignment.
EDIT: It could also be a loose upper front ball-joint where it attaches to the A-Arm
[This message has been edited by DaytonTD (edited 08-05-2013).]