Talking to the mechanic at the dealer, it was suggested to remove the 3.8's plug Heat Shields which is a common known problem causing wire sets or individual wires to fail. I'm not sure if it's due to rubbing physically or what. This was in response to my cylinder 5 misfire and discovery that moving wire 5 to another made the misfire move along with it.

Anyone else seen the same or been told this as well?