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Super helpful response coming in, thanks guys. I think you're all right. Not sure if Nissan's stock ecu switches between closed and open loop but like I said, the problem is only while cruising and I get that spike. Just really picky about how my car runs, but I never really thought about the positive pressure and vacuum while the car is doing that. I'll keep an eye out on my boost gauge that reads vacuum as well.
It's running a mostly stock setup with bolt ons, stock MAF and original o2 sensor btw.
I'll check sparkplugs soon and see how it's doing, last time I pulled it about a month ago it was fine. I'll keep on monitoring it based on the info here.
Thanks for all the feedback!
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