318 MAX fuel economy builds?

I installed Pulstar plugs, no other changes, & my idle rpm increased. There is mileage & power in ign. After having the plugs in the engine for a few months, the engine dropped a cyl. One of the Pulstar plugs failed. If a more reliable version was available, I would use them. Thank Allah that people are willing to try new things, otherwise we would still be using the two piece, 18mm plugs that my vintage Harley used.