2018 Chrysler Pacifica Touring L
There is a test kit to test for exhaust gassed in the coolant. With the engine running you suck up a sample from the coolant overflow tank. If it changes color there is a leak.Keep an eye on your coolant and see if it goes down. That is what I noticed after getting the misfire. Then I pulled plug 3 and it was wet and smelled like coolant.
Combustion Leak Detector