What I dont get looking at these charts, is what is the throttle plate position %? The throttle plates are open fully all the time right? So how can you get a reading from that? And how is it relative to the pedal position %?

You are just controlling how much response you are getting relative to the pedal position, if I put 75% on my pedal I really like to be nearly fully open ref plate position. NB - These are all MT
Here is a trhottle map from an STi, COBB even changed the format later but it all does the same stuff. Does not make car any quicker, just more responsive I feel, and smoother in most cases.
http://i116.photobucket.com/albums/o...ithjrottle.jpg

ok i get it better know!

I finally got a chance to get some cheap air filters. I just went to NAPA auto parts to get the cheapest filter they had. My car WAS experiencing the problem when I arrived, and it's rather cold... about 40ºF. It took about 10-15 minutes inside (an ambulance and fire truck showed up after I did, blocking me in). During that period, I went ahead and replaced the air filters. The car was fine my whole trip home. It felt great. I'll let everyone know if I still feel it with stock(ish) air filters.
It would be pretty pathetic if that was the cause.

huh... that would be weird, but very good at the same time.

I run stockish air filters and still have the gas pedal delay issue. It is not a fix...at least in my case.

I saw this random photo pop up on this site from one owner.... what do you guys think about this chart?

Nissan 370Z Forum - Dsphoto's Album: 370Z Roadster - Picture

looks like what it feels like!

The red and green lines definitely describes that stall feeling. The black line with the dip describes the "clunk" or "fuel cut" feeling where the car initially accelerates, but immediately gets weakened as if the ECU is holding back power.

Bummer =\

Holy crap... I think that's almost exactly what it is... It's good to see it on paper!

I'd just add that it feels like more than a 10-15hp drop, but that kind of visualizes it for everyone else. You get an initial surge followed by an immediate loss in power, followed by a second surge and full power. This takes place over the course of 2 seconds or so after giving the car throttle.

I was thinking that last night after I posted... It's more like a 50% drop. Considering I've had days where I almost stall out.

I think 50% is a fair assessment.

My car is bone stock and I feel this delay. In first gear coming out you get a slight lag, then it moves. My 04 350Z did not have this delay. Might be designed from factory like that?!