92 mustang gt convertible drive window doesn't close all the way about half inch from top?

It's 1992 ford Mustang gt convertible the window goes up and down a bit shaky when going down and up but does not make a seal to weather stripping need help As soon as possible please

Could be the motor wearing out, or a slight problem with the electrical

You need to pull the door panel and lube the slide in the regulator mechanism. It jumps like that when it's dry. While you're in there, you can adjust the glass position in the regulator holders and replaced the felts on the guides.