@Xenophon @Evil_Bender @charliebrownau The damage for a sparkplug change is $10 for the plug, maybe $20 if you have dual plugs like some of the ram trucks. Could also people coils, or the sign of greater problems (piston rings beginning to fail). Best to pull the plug and check how it looks vs a new one. Is it covered in oil or carbon? Check the gap with a $3 measuring tool you can buy at the auto parts store. If the gap looks good and it's not oily, you swap it with a new one and save the old one just in case. If the problem doesn't go away, swap the ignition coils around (assuming it's individual packs).