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.
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View my fuel log 2015 Mirage ES 1.2 automatic: 40.5 mpg (US) ... 17.2 km/L ... 5.8 L/100 km ... 48.6 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.
Replacing a spark plug boot on a Mirage -
https://www.youtube.com/watch?v=aTtMqlzsgrI
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 -
https://www.rockauto.com/en/catalog/...lug+boot,10150
Hey Dirk is this the original engine?
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View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)
I've never bothered replacing a boot on these cars. They don't stick to the spark plugs and the chances of damaging one upon removal is slim to none. An out of town independent shop claimed a car needed plug boots, I got the old ones back. No signs of damage, I just put them back on the engine I robbed them from.
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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.