I think it could have something to do with engine, catalyst, O2 warm up, etc. Most mornings when it is cool on my way in to work I get the slight surge at almost the exact same place every morning.
I pull out of my driveway and onto a 70 km/h flat road with no stops or turns for ~15 min with little traffic, so my throttle input is pretty much constant. If your commute has lots of stop and go or throttle changes I don't think it would be noticeable, but it is for sure there.
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2011 Nissan 370Z Touring/Sport, 6MT, KAD
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