If its an old engine maybe because its burning more oil. On the other hand it may be running rich and need a tune up.
The IAC valve is just that...The Idle Air Control Valve. It is responsible for keeping the idle at set parameters. And yes, it can make the engine idle at high RPM.
Flooring the gas petal.
A typical idle speed for a normal car engine is 600 rpm to 1,000 rpm. It is higher for buses and motorcycles. RPM stands for revolutions per minute.
failure of head gasket :)
It maintains engine idle rpm when the throttle is closed.
750 rpm
when the engine starts and is warming up the idle is supposed to be at around 1500 rpm but when the engine warms up the idle should drop to between 700 and 1000 rpm. if it doesnt drop then see a mechanic because it is a very complicated fix
normally idle around 1000rpm
It is intentional, it is called high idle. It helps warm the engine to proper operating temperature.
when u first start the car it will idle high, around 1.5 rpm to 2 rpm. when its warm up it should idle between 700-1000 rpm
About 600 RPM
maybe you need your computer reflashed. It worked for me.