5.2 magnum options

miss is worse cold, under 2500 rpm, load or no load. seems like its more than one cylinder not a steady rhythm. I am not sure I don't have a lobe or lifter failing ( roller cam ) that is part of the reason for the tear down.
it can be hear, felt & seen by the shaking of the car. in gear out of gear, cruising all the same.
it may still miss above 2500 but at that rpm its hard to hear/feel.
I haven't looked at the voltage while driving but while in the garage there is 12+ at the module/distributor or MSD box when it was in the car.
I have built, played with and tuned several cars. this one is driving me nuts! I seriously suspect a valve or cam issue. but the fact that it bounces around seems odd.