I've got codes po171 and po174 its saying 6 of my pistons are misfiring too, I've checked the Maf and o2 sensors and they are good I was wondering how much it will cost at a dealership to r3place all the vacuum hoses cause I'm on a last straw here. And when I try to start my car it comes up with a car and a key symbol and a red battery light its like it wants to start then it won't plz help!