Ok so im having an issue on my 97 Jimmy. Im getting 5 different codes. P0740, P0753, P0758, P0785, and P1860. All from what I've read are set off when the ignition starter switch goes bad. Now I did replace the harness and it was fine for a few weeks and now it's throwing the same codes again. I'm not sure what it could be????? I did get the new ISS from NAPA but I don't know if that would have something to do with it? I have heard of some GM's needing actual AC Delco parts to work properly. Can anyone help!?!?