After you take the door skin off you can get decent access to the window tracks. With a bit of patience and some creative tools to reach around you should be able to clean them up real nice and re grease them with some high quality synthetic grease/HHS-K oil spray (I used HHS-K on mine... That stuff is a miracle in a bottle, I use it everywhere to lube things from hinges to sunroof tracks on newer cars). It makes a HUGE difference, I did this job myself with the window tracks still in, door skin removed and the window speed is a lot better, they even work below freezing!
To remove the door skin you'll need to take the plastic torx bolts off, the door handle and lock assembly, and a few bolts behind the outside black plastic "trim". There are also bolts/rivets on the bottom of the door that need to be removed. Be sure to order new clips that go behind the black plastic "trim" from the Fiero Store, they are guaranteed to break upon removal. There are tons of guides to remove the outer door skins around here. To save you time, here is a good thread:
//www.fiero.nl/forum/Forum9/HTML/000019.html------------------
"Discord"Red 1988 GT under restoration!
Let's Go Mets!
( ͡° ͜ʖ ͡°)
[This message has been edited by Shho13 (edited 01-05-2019).]