I had a problem on my morning ride. About half way through I noticed that when coasting, my rear Cassette (or Cog-set, I forgot the exact terminology) on my 2005 Lemond Sarthe seemed to want to go forward - this pushed chain forward an inch or two and then the chain would snap back. This would happen a couple times a second, depending on my speed.
I decided not to coast anymore during the ride (good practice if I ever want to ride a fixie) because the chain was slapping to much against the chain-stay that I was afraid of damaging the paint.
What could cause this? I did notice when I got home that my rear wheel is out of true - could this cause the hub to not work properly?