99runnersilver

My sunroof recently started acting very sluggish so much so that when you open it it actually stops moving all together- every time I push the button the sunroof move s about an inch and slows to a stop. I'm not sure if this indicates a bad motor, or is there something I can lubricate? Or is there a more serious problem with my electrical system? Thanks! It's a 99 limited 4runner