I had a 2007 Altima 3.5SE and the throttle was sticky on it. Just because it is drive by wire doesn't mean that the pedal might not actually be sticking. The 370Z also does some very strange stuff on startup. If the throttle pedal is even touched during the first 10-15 seconds of running, the engine will rev VERY high. It's just part of the VVEL system operation to reduce hydrocarbon emission on startup.
Take it back to Nissan....they can tell you what's going on.
The ECM will throw an error code if the throttle plate isn't closing completely when it is suppose to. May or may not have a check engine light.
Late,
Trav
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