what do i do when a torrent is stuck?

what do i do when a torrent is stuck. i know its not seeded and everyone who had tried to dl it is stuck at 84%. is there anything i can do to finish it. or do i need to find another torrent (there arnt any).

Write a torrent cracker that tries to generate data that matches the hash of a block.  If lucky you will generate the right blocks and end up with a completely valid torrent -- in a couple years.