TB's can get dirty and cause low RPM's, I've cleaned mine and I saw a little better idle. Very easy DIY, like 6 screws and a little bit of pulling, and you can use a microfiber cloth with TB cleaner to wipe them down
However you say theirs nothing wrong so theirs nothing wrong.
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2012 370z 7AT- ES2 with PSS, K&N Drop-ins, LED's all around, Berk HFC, FI CBE non-res, KW V1's
2003 A4 5MT- The Beater
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