OK here's the situation. It feels like there is a little skip when I'm pedaling. At first I thought it must be a stiff link in the chain, so I looked in to that and got no results. It happens always when my left pedal is at 6 o'clock, but only when I'm using the big ring. If I'm using the little ring everthing is smooth. I looked at the big ring for broken/bent teeth and couldn't find any so I'm totally lost. That is why I'm here asking you smart people. What is wrong with my bike?