2001 firebird misfiring?

#5 cylinder checked cam &crank sensors with vantage meter repaced wires and plugs checked comp 125 all cyl noid light flashing spark tester firing # good companion cylinder on the coil not misfiring icm checked duty cyle thats good to no way to test pcm if it were the pcm wouldnt it misfire the companion cylinder as well checked for corosion at pcm plug none present what next even moved coils misfire did not follow