its a 91 n/a with a sun roof that hits dead zones through out it. you have to help push it open. what needs to be replaced, how much, and how hard?

 

you should sray it down with WD-40 to see if the rails are all dirty, after that. put some good lituim based grease. if it still sticks, then the motor is a lil shot. very easy to replace. the hard part is removing the sunroof assembly. good luck, you need another person to help you put the whole thing in agian. opps price for a motor can be around 15 on ebay