So the side windows in my stang on the right side, is rather slow going up and down, is it just a bad motor or whats the deal?

 

Probably not a bad motor...
...but it could become one...

Slow movement of the window is usually a sign of high resistance either in the window regulator or angle of assent...
...the window probably needs to be adjusted to relieve resistance...

peace
Stu

 

Check out this former sticky for the adjustment

Stu