I discovered that my TPS was bad and, being too cheap to go buy a new one, decided to try and fix the old one. I discovered that they're pretty simple and can be easily repaired, if you're careful. Here's how:
1.) Open the plastic housing by carefully prying up on the four plastic clips that are holding the two halves of the housing together. Try not to break the clips, but you probably will. Don't worry if you break them because the two halves are held together by the bushings and screws that hold the TPS to the Intake manifold.
2.) Separate the two halves of the housing by carefully prying the haves apart. Be careful to not stick the screwdriver into the inside because there is a small rubber gasket between the two halves.
3.) Remove the white inner rotating sliding device.
Now that you have this thing apart, you can see how simple it is. To fix mine, I only did two things:
1.) CAREFULLY bend toward the carbon rubbing face on the two metal arms that are on the white piece that moves. You are trying to SLIGHTLY increase the amount of force that holds the metal arms onto the mating black carbon surface.
2.) CAREFULLY clean the face of the carbon surface and the metal arms that ride on it. Use a clean, lint free cloth. (I first used a Q-tip, but that didn't work very well, because it had so much lint on it.)
3.) Put the three pieces back together exactly the same way they came apart.
That's it! You just saved yourself the price of a $90 part.
I can't figure out how to attach the pictures I took of this event, but don't worry about it, because this whole thing was pretty straightforward.