rob54

I got a 1995 s10 Blazerwith the trouble codes po122 ,po1122 and po404 replaced the tps switch rang out the wires from the vcm and the ground still could not find thefind the problem. Runs good till it acts like its running out of gas stop shake the wiring harness and it runs fin again. the main one on the passanger side. I think it is ether a bad ground or a bad power supply problem. just not sure at this point where to look. one other thing some times when you turn the ac or heat on temp gauge goes all the way hot. This is my sisters truck and I am trying to help her out. One shop told her it need a new wiring harness. Hope some one can help Thanks Robert

dragonrpc

Check the Main ground (near oil pan) I had put some fog lights on and started having lots of intermitant electrical issues, found that ground was all gunked, I degreased it and clean it and batery terminals and resolved all the intermitant issues
hope it helps and is a quick fix