Help! Running Rough

Having problems keeping the bike running. I turn it on, fuel pump primes and everything, start it, and can only get it going with serious throttle, once at 7000+ RPM's it is flawless. Back down to idle and it chokes out. Fouled brand new plugs trying different things out. I've changed the plugs,oil, cleaned the fuel injectors. Any Ideas as to what's wrong?
Thanks in advance for any help!