I’ve got a 2008 G37 Sport (manual).

Scenario: Typically within a couple minutes after a cold start. Driving around a parking lot or garage in 1st gear. I press in the clutch just to coast and the rpm’s will rev up to 3000ish. It eventually will level back out but if I let the clutch back in, it’ll go away much faster. It’s super obnoxious and I can’t figure out what’s causing this. Has anyone ever had a similar issue or know of what may be causing this?

Any feedback is greatly appreciated!

 

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I have noticed this as well even on my swaps however it's only in the first few seconds of cold start. I usually let the engine warm up for a minute before I start driving. Usually goes away after 30secs