Hi so I have a 97 f250 and the pcm is toast on it, it'll stall after idling for to long or even just driving. So we took the pcm out of my 96 and tried it in my 97 it worked perfect so we took it out and put it back in to the 96 found out it actually has a superchip that plugs right into the pcm must have beeen on there when I bought it so we plugged it in but the truck won't start with or without the chip any ideas? there both federal trucks

 

Have you checked fuses 8 and 22 in the under hood fuse box?