Just a word of correction, the V6 has coil on plug, not coil packs, different systems. Regardless, you have battery power on one side of the coil connector, and a pcm controlled ground on the other. With multiple transistors cooked, you have a problem that needs fixed before you put another pcm in. Make sure you check the powers and grounds to the pcm, and also check for shorts to ground in the wiring to the ignition coils from the pcm. Follow thru what Billwill said, as that is a sound starting point. If you have the old ignition coils, check their resistance on the primary side, the two pins where the connector plugs into, then also one pin at a time against the secondary side of the coil...where the spark comes out.