1985 Pontiac Fiero SE

Have you checked to see if you are getting good fuel pressure?
Do a compression check on all of your cylinders to eliminate intake vavles.

You will need to either buy or borrow a compression gauge. Remove all of your sprak plugs, and you will need to disable the ignition circuit. Screw the compression gauge and hose into the spark plug hole of the first cylinder. Have someone turn the engine over about 3 revolutions and you will see the pressure build and stabalize. I would think you should get atleast 120 psi or more on each cylinder. But most likely if you have one bad cylinder, it will be alot lower than the others.

Have you checked to see if that spark plug is firing? You need to check for aprk at that plug. Look for a bad apark plug wire, or bad spark plug. Could be not getting enuff fuel pressure to run smooth also. I would check your plaugs and your fuel pressure. If you are getting good fuel, good spark, then that leaves timing.
In re-reading your original post, you fuel pump may not be pumping properly. I would check fuel pressure next. This is how the manual describes a fuel pressure check.

FUEL SYSTEM PRESSURE RELEASE

4 & 8 Cylinder Engines

With engine Off, remove fuel pump fuse from fuse block.
Start engine and allow to run until fuel supply is exhausted.
Crank engine an additional 3 seconds to ensure fuel supply is exhausted.
Install fuel pump fuse.
On 4-112 and 4-121 overhead valve engines, install fuel pressure gauge between throttle body side of fuel filter at the rear of the car. On 4-151 engines, install fuel pressure gauge between TBI unit and steel fuel line. On V8 engines, install fuel gauge between front and rear TBI units steel fuel line.
Start engine and observe fuel pressure. It should be 9 to 13 psi.
Relieve fuel system pressure. Refer to steps 1 through 3 above.
Remove fuel pressure gauge and reinstall fuel lines.
Start engine and check for fuel leaks.
FUEL SYSTEM PRESSURE TESTING

Before servicing fuel system components, fuel system pressure must be released. To relieve pressure, proceed as follows:

Remove fuel pump fuse from fuse block.
Run engine until fuel remaining in lines is consumed. When engine shuts down, engage starter for approximately three seconds to relieve any remaining pressure.
With ignition off, replace fuel pump fuse.
Remove air cleaner and plug THERMAC vacuum port on throttle body unit.
Remove fuel line between TBI unit and fuel filter or between front and rear TBI units on ``Crossfire'' injection systems. Use a suitable back-up wrench to hold flare nut on throttle body when removing line.
Install fuel pressure gauge J-29658 or equivalent, between throttle body and filter or, on ``Crossfire'' systems, between front and rear TBI units.
Check pressure reading with engine running. If fuel pressure is not between 9 and 13 psi, refer to ``Fuel System Diagnosis.''
De-pressurize fuel system, remove pressure gauge and reinstall fuel line.
Start engine and check for fuel leaks.
Remove plug from THERMAC vacuum port and install air cleaner.

I would check the fuel pressure. I posted instructions on how in an earlier post.