This certainly looks like a weak spark / grounding issue on that plug. It might be a different cylinder than the one that was previously replaced or the replacement went bad. You have a lot of heat and humidity in the south which will find any "weak spots" and cause havoc.
View my fuel log 2015 Mirage ES 1.2 automatic: 40.4 mpg (US) ... 17.2 km/L ... 5.8 L/100 km ... 48.5 mpg (Imp)
Dirk Diggler (05-28-2021)
Boot didn't look bad at all according to my mech friend, I'm going to do a hwy test tomorrow and see whats up. Probably do a compression test too. At least I got those fresh plugs in there, power felt better too but that could just be in my head.
I would replace the spark plug boot for the spark plug that looked green. It's a cheap item to try first.
Rockauto.com only has one left currently -
Hey Dirk is this the original engine?
View my fuel log 2015 Mirage ES 1.2 manual: 49.5 mpg (US) ... 21.0 km/L ... 4.8 L/100 km ... 59.4 mpg (Imp)
View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)
I'll say weak coil.