i am getting the code P0300-P03002 random misfire and i just bought this car. I went to precision tune they said that i have new spark plugs and wires. what could cause this problem. before i get the injectors clean i was reading it could be other problems such as a vaccum leak so what is best to get a diagnostic or just get the injectors clean? Is this a very serious issue?

didnt say what engine>>>if plugs are in valve cover>need new seals..

2.0 4 clinder engine

i really need an experienced tech to help me here. i am getting random misfires from the cylinders of a 4 cllinder 2.0 eingine dodge neon. i really need advice.