If your 1983 Datsun 280ZX won't idle, it could be due to several reasons, such as a vacuum leak, which disrupts the air-fuel mixture, or issues with the idle air control valve. Additionally, a dirty or failing fuel injector, a clogged fuel filter, or problems with the ignition system could also prevent proper idling. Checking the fuel delivery system and ensuring all connections are secure may help diagnose the issue. Lastly, a malfunctioning throttle position sensor can also affect the idle speed.
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