There will always be some slop as the cables have to have clearance inside the outer sheathing of the cable. When you push the inner cable goes against one side and when you pull it goes against the other side.
With the console off move the shifter around and see where the play still is. Have someone else do that and look at the trans to see where there is still some play.
Fiero Parts And Acc's Web Page:
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Rodney Dickman's Fiero accessories
7604 Treeview Drive
Caledonia, WI 53108
Phone/Fax (262) 835-9575