how do i replace the coil pack on a ford ka?

unluky mate.
my daughter KA v reg is the same.
I could`nt get all the torx bolts out of old coilpack, so fitted new one on big ally engine mount to left of engine, great I thought, but no, engine still missfiring on middle 2 plugs, so bought new leads & plugs
still no good, starts fine but wont rev on 4 cylenders, but returns on 4 at idle!
HELP!

ivor
December 2011