1997 gmc v-8 runs on 6 cylinders

baffledtonoend

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So I have replaced new fuel pump fuel filter fuel injection spider d-cap rotor plugs wires coil ignition control module fuel pressure is 61 psi when cranking, spark at each cylinder coil to cap cap to wires wires to plugs good, compession good, replaced ground strap's this morning and still no start on 8 cylinders but will start on 6 cylinders random plugs removed, #2 and 4 or # 3 and 6 or any combonation, put them back in block no start so what is it I am not catching, good signal from cam and crank sensor I don't know where the problem is can only go back to basic's so many time's any help would be great
 


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