I need some help with a 97 7.3 that was brought to me by another shop with a no run condition. After much testing we have determined that the electrical system has been shorted out either by crossing battery cables or something else. We had to replace the PCM and IDM to get the truck to even run. Now it will start but idles very irradically, sometimes it idles decent with only a hiccup like a bad signal from the cam sensor sometimes it cycles between nearly dying and then back up to around 800 rpms and then bounces back and forth between the two. The truck will rev up if you pump the throttle from full throttle to complete idle but will not hold any rpm. If you floor the throttle there is little to no response at all the truck just stays in the irradic idle. In addition to the PCM and IDM we have replaced the CPS and the UVC harnesses. The pcm that we have gotton is from a 94 and is not OBDII capable so I cannot retrieve any codes or check any sensors with Autoenginuity. I am at a loss of where to go next and do not like throwing parts at something trying to fix it.