Look under the car. On a Fiero without a top there MUST be a subframe. The one on my ragtop is a box frame made from 1 x 3 steel channel that connects both front frame rails to the rear toe plates where the front cradle mounts attach and to the cross member on the front. . If the car has no subframe, the vehicle will flex and will be unstable.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "