Felt like I had some lag in the throttle while starting from a stop.

Seems to have the same thing while parked. Whoosh sound then accelerates. See attached video. I’ve cleaned the throttle bodies. No codes. Any ideas? 91 octane.

 

Lag and hesitation, get it when in drive from time to time. I remember the 350z community complained about it when this engine first came out.

 

I've had this from time to time. Sometimes worse than others. Typically going through the idle air volume learning procedure cures or at least minimizes it.

 

How many miles? When was the last time you have changed the upstream O2's?

 

If you search you-tube for throttle relearn there is a video that has a good one on throttle relearn. There is also one on resetting or clearing ECU. Also disconnect your battery terminals for 5-10 mins, get in and depress or push your brake pedal and hold fore a couple seconds. Do that aprox. 4or 5 rimes while battery is disconnected. I'd do that first before the 3 part reset stuff. by pushing and holding brake pedal while battery is disconnected it supposedly releases energy which stores in the systems capacitors. This energy also can keep memory enough to not completely reset the ECU etc. Also for the ecu reset there is a guy who sets time by using his cell phones timer. he is in the dsrk and you'll see it on you tube. He does the best video to help you time the procedure.. You better focus and be very good at timing, and tell wife, kids and everyone to stay away from you for a good hr. If you are part ninja, can spin plates on a stick, while juggling, and tap dancing to the tune you're singing, should be s piece of cake. Hope this helps.