94 LHS intermittent starting problem

MY son has a 94 lhs and intermittently it won't start. Some times it doesn't have power to the b terminal at the coil. I've switched out the ASD relay and the cam sensor. It seams to be point to the PCM but I'd like more opinions before I buy one. The car has no codes.
Thanks!

May be an ignition switch problem, one of the accessory contacts bay be going bad in the switch.

Thanks! AWP I'll check that out.
Anyone else have an opinion?

check also your battery connections, make sure they're clean and tight. Also, check your battery, make sure it's not too weak.