If you have an engine that idles at 6000 rpms, you need to have it checked - immediately. Around 750 rpms would be normal.
because it was designed that way... most engines idle below 1000.
You have a vacum leak. A big one. Check all your hoses. Idle should be under 1k rpms
Most cars are anywhere between 750-800 rpms
It should idle at aprox 650 rpms warmed up.
of Idle
800 rpms.
640 rpms
5 to 6 hundred rpms. Is recommended idle
725hp at 6000 rpms
at about 6000 rpms
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.