how long is the stock throttle cable on a 1984 Fiero?
I don't want to disable my car just to find out the length and then sit around waiting for the new longer cable to arrive.

Good luck finding a longer one. Most cars have a cable that is much much shorter.

That job really sucked. You really got to tear the car apart to get in there and work on that.
The cable ended up being 9 feet long. I didn't plan this job well enough and so I ended up stranded just like I hoped would not happen and my girlfriend had to come over and drive me around to get different parts.

I got the braided Spectra 3' cable from AutoZone and left the original sheth in place. Starting from the carburetor side I installed the braided cable then cut the stock sheathing where I wanted and coupled the two Sheaths together.

All done, the answer is 9' for my application.

One trick that might be helpful to some but too late for you is on my 88 Mera I moved my cruise control unit behind my trunk. The Mera is longer and behind the trunk under a cover is about a foot of unused space save the tail lights and reverse lights housings. I spent a length of time in a local junk yard and found a short cruise cable from some (probably GM) car. I made a bracket and inserted the existing cruise cable into one end and the short cable into the other end. It was steel. I probably drilled the ends and filed the holes to be square. Then I made some kind of clamp to clamp the 2 cables together. Works great for many years now. When I first bought my 88 Mera someone at a car show said that is a GM cruise control unit. So I hid it so no one would ever see it again.

Rodney Dickman
1988 Mera