Thanks for all the responses. I took the bobbin assembly apart enough to be able to check it thouroughly. Cleaned out some dirt and put a little oil on the moving parts. Then I loosened the tension just a bit. Then I took the upper tension apart and cleaned it. I also replaced the screw holding the faceplate on. It was a large screw and the thread was getting wrapped around it. I'm not sure which fix worked, but it is no longer skipping stitches and purrs away like a kitten.
