I'm having the exact same problem. My 2013 370 Z convertible with sports package, occasionally loses power at start-up. The car starts fine but when I start driving it feels like a 2 cylinder car or like the power is going through a bottleneck when I accelerate. I can floor it in 1st and it doesn't have the beefy throttle as usual and does this in all gears. This is not like another thread I read where the Tach won't go past 3500 rpms. It drives completely normal except that there is a strained acceleration.
I can pull over. Shut the car down and start it back up and run just fine. Happens once in a great while.
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