OK, I'm here now. Motor guy Googled yesterday. One cause could be too hot of a plug. The carbon sticks to the hottest point. I've increased the gap to .050 on the hot plug. After I do a compression test, I will use a colder plug. It can't hurt to try. He seems to think the rings may not have...
A fellow truck driver told me he saw a man with three arms. He was driving a Mack and waved. I drove a quad axel Mack Log truck with a 565 hp Cummins for about 10 years.
Thank you, Eric. Now everyone knows I'm over the hill for sure, but not how far. I don't know how to act my age, because I've never been this old before.