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640 rpms
You have a vacum leak. A big one. Check all your hoses. Idle should be under 1k rpms
your alternater is most likely shot. if you replace it and the battery you should be good as new.
Most cars are anywhere between 750-800 rpms
of Idle
It should idle at aprox 650 rpms warmed up.
If you have an engine that idles at 6000 rpms, you need to have it checked - immediately. Around 750 rpms would be normal.
800 rpms.
5 to 6 hundred rpms. Is recommended idle
an idle rpm for a 350 stadard trans. is about 500 rpms. an auto is about 750 rpms. this is if the eng. has a stock cam. if not it may vary
Because of the loss of backpressure if can affect the idle.
Apporximately 1200 RPMS