You can try bleeding but if either the clutch master or slave cylinder are worn, they will not bleed correctly. I would try Rodney Dickman for new parts that work or you can take a chance on Rock Auto. Since your Fiero is 30+ years old I would just replace both and then bleed the system using a Mityvac (vacuum bleeder) . For the trans to shift smoothly, the clutch hydraulic system is very dependent on a proper bleed. If done properly the clutch will release fine
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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, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, 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 "