Ok, thanks. I had removed the toaster style loops loop from and to each plug, cleaned for good connection, cleaned the ground etc, had the system working great and then the #4 plug melted. Scratched the interior of precombustion chamber and blew out with air, replaced the plug again and it lasted 1 day.
The suggestion of installing the pencil style plugs; I've read about them, but how can you not replace the relay when switching to them?
See actually I'm working on a neighbors car, got the inop glow system working and then the issue with the #4 plug started.
I appreciate all the good advice.