Any ideas what is wrong its was moving real slow and now it just died????

The motor may have finally died, or there is something else that is putting more load on the motor then it can handle.

Same thing happened on my '83. Before purchasing a new motor, take the panel off and check to see if the nut holding (I can't remember exactly what it looked like in there) the wiper or the motor to the hatch. I tightened it up, voila.

Ditto. the rear wiper on my '83 is doing the same thing, I haven't checked it out yet since I also have to do some work on the latch (what good is a wagon if the hatch dosen't open?!) Just one more on a endless list of things to do. Atleast I'm making some progress; today I got the skid plates off my '84 to replace the missing ones on my '83. They're calling for snow this week... tee hee hee

remove wiper arm , nut, dust boot, and everything else, and penetrate