New plug wires cured all problems. I'm certainly aware of how wires can cause misfires and what that sounds like, but that "bang"? Crossfire I guess. When they say that it can cause a piston to end up in the
oil pan, they arn't kidding. It's a very destructive sound.
By the way, if you ever get plug wires that need the dist end adjusted to length and boots and terminals installed, get a spray can of silicon
oil. Without it, forget about sliding on the boots.
Thanks to all who offered their thoughts. I appreciate it very much.