The easiest/ first thing you could do is check all the connections on your G3 Intake tubing. Whoever installed may not have tightened them up properly. If they are not sealed you will get symptoms like what you are describing, and EVENTUALLY you will thorw a code. (I know form experience).
Hope it's an easy fix
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Chris
'70 Datsun 2000 Roadster
'09 370z- Invidia, Stillen G3, ZEnclosure
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