My window motors work but the windows don't stay on track.Does that mean that the guide clips are bad?

That sounds like what the problem is. A detailed discussion about the window fix, common to these B Bodies can be found here:http://www.automotiveforums.com/vbulletin/showthread.php?t=562839
A tutorial with pictures can be found here:http://impalassforum.com/tech/interior/windowfix/index.htm

Thank you!