OH noes

Ran into a problem today. Well yesterday it started but i didnt think anything of it till now. While at w0t my bike dies like it lost spark. Then when i go to like half throttle it kicks back in. I tock the petcock off and found out the filter thats on the pet cock was all tore up and nasty and fell off.. so i cleaned off the petcock. still having the problem.  =/ so its time to find out whats wrong with it.