Hi, l have a 1989 Holidaire motorhome on a Ford chassis with a 7.3 International diesel in it. It quit two years ago and will not start. Had the injection pump rebuilt but still will not start. Changed injectors and lines, had small electric pump feeding injector pump, go new injector pump. If there a computer shutting me down? Where do l find this computer and how do l make it let the engine start? Oxcart 44