I have the same issue on occasion, and had the same issue on my G35 sedan which was the reason I sold it. It started out with the dip in idle then progressed to almost completing stalling then would stall. I could never replicate it for the dealer. Not a month after I sold it the technician that tried his hardest to find the problem called me and said Nissan had finally issued a tsb for it. So long ago I can't remember but I can dig up the tsb he emailed me if you want. Cost was $2k in parts alone, something about cams and magnets not sticking when oil temp is warm.
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2012 Z-SOLD
2014 Nismo #565 Fast Intentions CBE/HFC/Swift/SPC/RJM/H&R-15/20mm/Z1 CAI/Headers/Intake Manifold w/Uprev Tune 328.31whp/263.64tq
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