Basic background on truck: In the last 6 months I have replaced all six fuel injectors, rebuilt the transmission, had two new batteries and alternator.
Code from truck is P1652 and J1850. The gauges go crazy, headlights go on & off, and on occassion the truck has died in the middle of the road. I left it with a very reputable shop who have had it two weeks tomorrow but they cannot figure it out after over 12 hours time into it. They have done all tests and the ECM shows ok. Tech has pulled the gauge assembly, electronic compass, radio, etc, and cannot find the problem.
I'm in the Atlanta area. Any suggestions as to where to go next?