It could
Souns like your OXYGEN sensor or a clogged air or fuel filter.
fuel pump, fuel filter, dirty injectors, it may also be a ford or dodge, buy a Chevy
Check your fuel filter, throttle position sensor , and timing
replace the fuel filter and run some fuel sytem cleaner (available at any parts store or Wal*Mart) through it.
Possibly clogged fuel filter or fuel pump is failing.
Rough Start, Low power will feel like car is starving for fuel. Unplug the mass air flow sensor and start car it should go to default mode and if it runs fine you have a bad mass air flow sensor.
the fuel pump is getting weak or the motor timing or/ spark advance is off
Your acellerator pump is allowing the carburetor to almost flood.you need to replace the accellerator pump piston.
Try replacing the fuel pump.
Check the fuel pressure on the Fiero to start with. It sounds like it could be starving for fuel.
Maybe your fuel pump is broke.
The 1974 Chevy truck has a mechanical fuel pump with a built in pressure regulator.