| probably sticking...a common issue with age. It's the Air Regulator valve and its behind the balance tube about tube center. There are a number of posts about this issue.. some try spraying WD40 (do not use silicon) into the valve to unstick. Otherwise the valve gets replaced. See this z1 web page - valve is at far right side. Runs $78 from them: https://www.z1motorsports.com/idle-air-system/nissan/300zx-complete-idle-air-control-package-new-p-6931.html For the other issue...does car not crank when key is turned? There's a relay in the driver side wheel well that if going bad can result in multiple key turns to get a starter crank. There are posts on this and how-to's on replacing the relay (really easy too).
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