Got a 94 F-250 PSD in the shop. Got the call from the customer about a week ago that they needed me to come read the truck at their shop and see why it wouldn't crank. So got there and after a buzz test found hi-lo side shorts on cyl 1-7. Told the customer to check the UVC harnesses since they wanted to try to fix themselves. They found one harness melted on the driver side and 2 glow plug wires melted one on each of the passenger valve cover connectors on the pass. side. They replaced the harness and spliced in 2 new pins for the pass side glow plugs. It fired up but was smoking white/blue really bad and smelled like raw fuel. Got the oil heated up to run the cylinder contribution test and it showed #5 and #7 cylinder contribution fault. Pulled the valve covers and ran a compression test and all cylinders were within 20 psi of each other (around 420 psi). Replaced the 2 injectors and the wishbone line that goes from the rear of the fuel pump to the rear of each head. Cranked it up... still smoking like crazy and still showing #5 and #7 on contribution test. ICP press was below spec so replaced IPR valve per Ford manual. When you unplug the harness for those 2 cylinders you can tell they are firing just not fully. I'm thinking PCM or harness. Any ideas?? Oh yeah and installed test IDM still does same thing. Fuel pressure 70 psi.