It's worn out, bad linkage or worn shift levers.
CLutch is buggered or might just be the clutch cable
Clutch is not adjusted properly.
your clutch may not be fully engaging
There may be some worn gears/bearings in the transmission, but more likely it's the aligning bushing in the clutch disk.
BAD clutch slave cylinder, wore out clutch and pressure plate.
If the clutch fluid reservoir is just low, no. If the clutch fluid reservoir is empty, yes.
It is the part of the starter where the gears that engaged with the flywheel are installed. The bendix contains the gear, clutch, and spring in one unit.
get a new clutch
if there is a clutch there, you have to.
It's probably either a worn/warped clutch plate, the clutch is out of adjustment or the pilot bushing/bearing is not operating properly.
The only time you need to use a clutch on a motorcycle is when shifting into First, You aren't going to do any more damage to the gears than if you used the clutch. Its designed to work that way.
Could be a bunch of stuff, but some of the earlier Fieros had an issue with the shaft connected to clutch pedal bending which would cause the clutch to not fully disengage. When your car's not running you can shift gears all day without pushing in the clutch. Try that when your fiero's running and all you'll do is chew gears.