Just wanted to follow up on this post that I had put up a while back. I finally replaced the small plastic filter/strainer that is connected to the tube that comes from the vacuum pump. After replacing it I have noticed a big difference in the shifting of the transmission, it is a lot smoother now. Also the air that was blowing from the defrost vents has stopped and works as it should, only when turning on the defrost. However the center vents still don't seem to be working. My feeling is that the flap maybe stuck. If anyone has any suggestions or recommendations I would greatly appreciate it.