Check the fuel pressure on the Fiero to start with. It sounds like it could be starving for fuel.
to me it sounds like your map sensor is going out, you might want to check that.
sounds like a fuel problem change the fuel filter first
Sounds like you may have low fuel pressure. When did you last change your fuel filter? JA
Does it run on choke? Is it starving for fuel, if so is the needle valve set for the float?
sounds like the ignition control module
Sounds like no gas is getting to the carb. Fuel pump maybe.
It sounds like it is starving for fuel due to a problem with the carburetor. Ask a guy at an automotive parts supply. A rebuilt carburetor will probably fix it.
It sounds like your dizzy cap isn't lined right which causes the engine to stay running after the ignition has been switched off. i had the same problem with my fiesta
sounds like the choke is stuck shut therefore running rich with black smoke
Sounds like a dead battery. You need the battery to start the car, but once it is running the engine runs completely off of the alternator (which also recharges the battery if the battery is still good).
sounds like coolant temp sensor is bad but also sounds like cat might be pluged