2004 e250 ford van blowing #8 pcm fuse

Question

pcm unplugged still blows-radio disconnected still blows wiring harnes un done to rear of vehicle still blows-relays removed still blows-

might sit a day then it will take fuse and run about 2 miles then starts blowing fuse

fuse goes to pcm-radio noise-injectors- unhook all above still blows fuses

Answer 1

you are going to have to start chasing down wires to find the short circuit