Howdy, new here.<br /><br />Lotsa questions.<br />My Dad has a 35 hp Evinrude, Mdl. #35902A, S/N E0001309, but I don't know what year it is, <br />so I don't know what maual to buy.<br />I'm having a couple of problems with it. First of all, it has a really bad backfiring problem. <br />Should I...