Tidy up iTunes library?
You could possibly write an AppleScipt to go through selected tracks, and change the name that way, but you would have to make sure you only select the ones in that format. 

Ive had to do this a few times before, and have tried various apps, but usually end up just digging in and doing it manually. While it takes time, I can give a lot more care to each thing, espc. artwork and genre at the same time. I usually just take a night and go through everything in groups (like artists starting with an A, then a B, etc).