No power to icm

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Truck has the 4.3 it ran good and just quit. Checked for fuel no fuel put new pump.truck started and ran about 5 miles and quit again had it towed home.checked for fuel at Schroeder valve good pressure. Checked for spark no spark replaced cap rotor and wires .Truck started up ran about 2 miles and stalled again had to tow.got it back home and checked for fire to plugs no fire.checked for fire to coil has fire but none coming out to distributer.replaced coil no help then checked icm at parts store said it was good but a friend that works on cars part time said replace the icm so I did but now no power going to icm but the old one had power also new crank sensor and ignition switch still won't run any suggestions