why does my car idle at 2000rpms ?
on 1992 Nissan 300ZX

i adjusted the idle down to 700rpms but as soon as i drive it the car idles at 2000 rpms

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2 answers
ck for vac leak, if you can't find one have a smoke test done and that will find it
yes do check for vaccum leak, the older nissans had issues with idle air control valve and ecm going bad causing to be unable to control idle.