my mustang 5.0 pops????how do i fix it??

i own a 1986 mustang gt 5.0.. and it pops..it pops at 2800rps..and i cant get itto go past4800rpms...it pops in everygear please help what the problem..

Please make one post and respect others by doing so, I learned that the hard way(Sorry HiFlow). Refer to the other post for your answer.