You've decribed my experiences exactly. Stock M6 2010 sport package with less the 2k miles. It's happened twice that were memorable and I was not in anyway way mashing the pedal but simply accelerating moderately from a stop light...the car barely moved into the intersection and then suddenly jolted forward like a rocket. The other time was turning right from a stop sign and even though I had lots of room to go, by the time the car responded (about ten feet after I had made the turn), I'm sure the car coming behind me had to brake. I've never seen any car that is so slow from a stand still sometimes and then it takes off like a rocket. Honestly this must look funny to bystanders; creep off the line and gone like missile. The VDC light doesn't come on so I don't think this is a nanny issue.

Has there been a consensus on a fix? Is it a fuel system issue?

You might have a misaligned brake switch as one of the members experienced and resolved. Try this method to resolve your throttle delay because it solved the issues I've been having for months. I posted pictures as a guide:
http://www.the370z.com/664697-post50.html

There are two things going for our 370Z in terms of throttle issues:

• Throttle Lag - Quickly press down the pedal, and the car stalls around 2k RPM before slowly rising to redline. It feels like VDC is kicking in, but there are no lights. This is a dangerous situation when making a turn and the car won't budge. There are numerous situations where you would accelerate and suddenly engine power cuts off or is limited for a few seconds. It's like the ECU is holding back power.
• Throttle Response - The throttle is less sensitive than the 350Z. Go test drive a 350Z and you find yourself giving gas too early between shifts, but you also find it easier to blip the throttle to downshift.

Try to resolve the throttle lag by visiting my post in the link.

As for throttle response, I'm at loss for words. Disabling VDC tends to improve throttle response because it seems like VDC is aggressive in cutting power even if there is no slippage. Plus, I notice power getting cut when oil temps hit 220F. I park somewhere, turn off the car, turn it back on, and the problem went away. It is annoying to feel abrupt power cut during normal acceleration as if it is being held back.

I think we need to take this up with Nissan.

I'm def going to check this out!

The Sprint Booster guys have confirmed that they have a 30 day money-back guarantee with no questions asked. I'll do this eventually but need the funds to keep the thing if I end up liking it. I'd suggest giving this a try if the throttle lag is bothering you and then report back to all of us.

Mike, can you elaborate on what you like about it and how it's improved things? My main issue that I'd like addressed is the slowness in throttle blips. If you sit in neutral and just blip the throttle, there is a huge delay in the revs building, then they hold for too long and slowly drop. My hope is the sprint booster addresses at least part of this issue.

This happens to me as well. At first I was turned off by it, but now, to lessen the effect of it, I accelerate slower. Though when I want to take off, I rev higher to get a quicker response.

What you are describing is what push me to install the sprint booster.
There are 3 positions with the sprint booster....stock...moderate and aggressive
you will notice and feel quite a difference.....let me know how it goes...Michaelm

Just installed the sprint booster and I had low expectations, but it is a very noticable difference, night and day!

But this issue could be resolved with a good custom tune?

How does this sprint booster effect wide open throttle for you guys who have it? Does it feel "normal" or is it blatantly noticeable where WOT occurs before the pedal is fully depressed?

This is my question also. Will a good tune help so you do not need the sprint booster?

I had a dyno tune done using the Cobb access port which I thought made a difference but the sprint booster just seems to have made the car a lot more responsive. In saying that, there are not a lot of tuning shops available in my area maybe someone with more experience with tuning 370's might get better results. But for the price I feel that the sprint booster has made for a much more spirited drive.

The Sprint Booster seems like it's just the thing for livening-up the Z's tepid throttle response, but the price seems a little steep. I know designing and making these products isn't cheap, but $330 is a lot of money for a product that only adjusts throttle response.

Heck, can't you buy a an ecu programmer with a canned tune for under $500? I think $150 for the Sprint Booster is more appropriate. At that price it's pretty much a no-brainer, those interested would buy it without thinking twice.

I would still like to know if a good tune can clear this up.. Can any of the guys/gals that have a tune chime in in a little greater detail?

Well I have an Uprev tune and I still have this issue.