(Forgive me if I don't have all the proper nomenclature down!)
When I would mash on the pedals, if out of the saddle or something, my bike would not hold a gear. It would sort of snap around as if the chain was in between cogs on the cassette, but it would do this repeatedly. If I went up or down a tooth it would still do it, though there are a few gears that are particularly tricky. I took it to the LBS, and the told me I had a bad chain ring. $ 45 bucks later (did I get ripped?) I had a new chain on hoping the problem was fixed.
I found out today that it is still doing it nearly as much as before. What is wrong with my poor bike?