Turns out I have the exact same problem. Car is bucking during acceleration... lucky if I can get it up to 40mph without the engine bucking like a horse and slowing down to 10-20mph. I'm at the stage where the sprocket is being replaced. I'm expecting even if this does solve the short-term problem... odds are I have the oil consumption problem. Oil was abnormally low when I brought it in. Still under powertrain warrantl so it sounds like I too may be forced to swap out the engine on a 2009 370z. This is crazy... not even 3 years old!
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