It's not in limp mode. It happens to me too. I beleive there is a TSB on this. Do a search. It has been discussed.

^ if you are talking about the TSB for the surge on AT's in 3rd gear, it is different from what the OP is describing, else list the TSB that might help the OP.

i did a search and came up with nothing similar. This happens in all gears.

A reset of the engine with removing neg cable on battery takes a full 24 to actually reset.

I just had the stumbling and puttering in mine but it was from sitting for six months. Through in some seafoam and it was fine.

I know for a fact that a faulty MAF sensor will cause similar symptoms, but that would trip a CEL, so that's weird

same thing happened to me, but it was when i was on empty so im assuming the fuel got away from the pickup.

I was fine for the last week, and it came back today. A bit milder, but i took a vid - Didn't have much space - but around 6-7 second it happens:


Wouldn't go past 4500 this time. I did it a few times with the same result. Last time was around 3000 and more abrupt.

nvmd

did you take your car to the dealer??? isnt it still under warranty?

Hmm that's odd.

Have you taken a look at your throttle bodies? I doubt they're the problem but no harm in checking them out and cleaning them to see if it improves anything?

Not yet. My experience with stuff like this is "Unable to duplicate" and I waste a day. The dealer is also on the other end of town, so I'd like to go in armed with some info before arranging appointments.

You do have the video ....why don't u send that in first to the dealer via email then see what they have to say?

Could it be possible maybe ur rev limited sensor ia damaged and the car thinks ur going into red line when ur not and its trying to preserve ur engine from damage?

2007 Infiniti G35x Sedan AWD V6-3.5L (VQ35HR)
Vehicle Level Technical Service Bulletins All Technical Service Bulletins Engine Controls - Cold Start Rough Idle/Idle Fluctuates


Engine Controls - Cold Start Rough Idle/Idle Fluctuates


Classification: EC07-008A

Reference: ITB07-045A

Date: April 27, 2009

2007 G35; COLD ENGINE START ISSUES

This bulletin has been amended. The Claims Information has been updated. No other changes have been made. Please discard all previous versions of this bulletin.

APPLIED VEHICLE: 2007 G35 Sedan ONLY (V36)

IF YOU CONFIRM:

Drivability issues as follows:

^ Rough idle during the first minute of engine operation after cold engine start.

And/or

^ Slight engine speed fluctuation during light throttle acceleration during the first ten minutes of driving after cold soak.

NOTE:
This issue, if it should occur, is related to engine temperature. It is NOT related to ambient (environment) temperature.

ACTIONS:

Confirm this bulletin applies:

^ Check and compare your Current ECM Part Number to Table A.

If that part number does not match one in Table A, this bulletin does not apply. Go back to ASIST for further diagnostic and repair information.

If applicable, reprogram the ECM.

NOTE:
To help ensure smooth engine performance, 5W-30 oil must be used in this engine. DO NOT USE engine oil with a thicker viscosity than 5W-30 in this vehicle.

IMPORTANT:
The purpose of "ACTIONS" (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire Service Procedure as it contains information that is essential to successfully completing this repair.

what redbaron said, you have the video so they would have to test everything out, tell em its a safety hazard and you almost got into an accident cause the car wont accelerate off the ramp, that should get them to take a proper look at it.

EDIT: that TSB is different i had taht done on mine a long time back, thats just for rpm fluctuation and NEVER limited the revs

That is what he is experiencing. The rpms surge and makes the car surge. It's not that is limiting your rpms. The surge happens when you have a steady light throttle. If you step on it more, it will go.