I had been having trouble with my passenger window not rolling up well so I thought I would check out the rollers and maybe replace the window motor. So last night Kendall and I started in. After removing the door panel we could see that the window mechanism uses three rollers. The bottom two rollers were loose and rolled well but the top one was bound up and would only slide in the track. This is an easier repair as the top track is held in by three screws and comes out easily. Then pry the roller off the shaft, drill out the center of the roller with a 3/8" drill bit, lube up the hole with grease and snap it back over the roller shaft. Works much better. We also did the motor as Kendall said 31 year old original motor? Do that as well.
One other thing. While inside the door take a look at the rubber boot on the door lock actuator. You will see that there will be a slice in it because the door lock shaft has a sharp edge to it cutting the boot and making the door lock work sluggish. Simple fix is to force the actuator arm off that shaft [don't have to remove the actuator], install a small hose over the door lock shaft and then slide the actuator arm back over the newly installed hose on the door lock shaft.
Door lock works like new and took less then 5 minutes to do.