engines jerky,missing,lack of power .1995 mondeo 2.5 24v?

ive just bought a used ford mondeo & it feels real
jerky,as though its missing,and it dosnt feel as though its got any power at all.One or two people have said that it could be plugs or leads,but i dont know.could someone help me please.ive wanted one of these cars for ages & finally i get one & straght away its got probs,its reall knocked the stuffing out of things .its the 2.5 v6 24v engine