I have a 2002 Chevy Tahoe, and recently I have noticed that all of the power windows and moonroof open/close VERY slowly. Does this indicate bad motors? Also, my rear wiper just quit working. I pretty sure the problem isn't related to the windows/moonroof issue. I can hear the wiper motor trying to do something, but the wiper doesn't move. Any help would be greatly appreciated. Thanks in advance!