Changing Spark Plugs on a Tuned Skyactiv 2.5L NA

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2015 Mazda 6 -- Skyactiv 2.5L NA W/ 91 Octane Tune
The spark plugs had approx 100,000KM on them, vehicle had almost 318,000KM.

Assuming that the NGK plugs I ordered from Amazon were pre-gapped, I put them in and forgot about it. I noticed a very light stuttering, at low RPM, using a very low throttle position. As soon as you were to increase the throttle in that scenario, the stuttering went away. Eventually, the CEL came on, so I pulled the plugs out to check the gap. They were all at around 0.030 (OEM is 0.044) - So, I gapped them all, and the stuttering went away!
 

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