Sounds like a vacuum leak on idle!

[Mauidan]

I have what sounds like a vacuum leak on idle (fssst), low RPM and when engaging the clutch.

It's intermittent and does not happen during acceleration or cruising. Although, it doesn't come close to stalling, It feels like a misfire.

I cant pin point it yet. Thoughts?

Catching up on 40k.
Mods: Guruded Gear, Akrapovic

 

[ShawnD]

Sync port rubber plug? This is what several of mine looked like on my previous vmax.

 

[Lunatic]

Exhaust leak?