I have an 85SE V6 Auto and had the same problem and was making it difficult to drive the car. I noticed that when I was letting off the gas I got a rearend sway, and when giving it the gas had the same thing.
I jacked the car up (back wheels) and found that the inner tie rods were shot. After replacing the tie rod ends I had no more problem. Watch the Mineke people they have a habit of mis diagnosing problems on Fieros' Click back here time to time..no one know more about Fiero problems than a Fiero owner.
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"When I Die I Want To Go Peacefully....Not Screaming Like My Grandfathers Passengers" 
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