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It should idle at aprox 650 rpms warmed up.
You have a vacum leak. A big one. Check all your hoses. Idle should be under 1k rpms
500-1200 The computer will decide.
between 500/750 depends on where the idle screw is set
There could be any number of reasons but it could be the idle is set too low. The idle is the rpms that your engine runs at just sitting there without you stepping on the gas. It should be somewhere between 800 and 1000 rpms.
The idle should be at 8 to 900 rpms, if lower then theres a idle screw on the side of the throttle body in front of the injector, turn it to where the idle needs to be.
It should be idling at approximately 625 rpm while the engine is warm.
Most cars are anywhere between 750-800 rpms
of Idle
No less then 9 LBS. at idle. And no more then 13 LBS. at 1500 RPMs.
If you have an engine that idles at 6000 rpms, you need to have it checked - immediately. Around 750 rpms would be normal.
z idle adjustmentTurn the idle screw - on the intake manifold - clockwise to decrease rpm or counterclockwise to increase idle. You should also look around for a vacuum leak