limiting data on a server and a potr

i have tried to limit data by packets per second and duration times but isnt working for me, any idears guys?
i am logged in on a yahoo server…cs130.msg.ac4.yahoo.com thru port 80, however these guys still flood my commection so bad, anyway i can stop this with a firewall? i love this firewall ,but maybe im missing something
thnx kev