I think our old van needs spark plugs long time ago I heard copper for wires is this true? It is running rough and hubby has put it on the reader and nothing comes up. it also could be the gas we put in it, since it was running great till then or the gas treatment. What do yall think? I know TiredIron use to help with bus it was diesel . It is a 1995 with 351 engine. And a good home away from home and tent carrier so not trading it in.