Is it normal for an engine to idle at 1000 RPM?

No, 1000 RPM is generally too high for a properly running engine's idle speed. Most gasoline engines idle between 600 and 900 RPM, though some may be slightly higher or lower depending on the vehicle and engine design. Diesel engines often idle a bit slower.

An idle speed of 1000 RPM suggests a potential problem. Possible causes include:

* Faulty Idle Air Control (IAC) valve: This valve regulates the amount of air entering the engine at idle.

* Dirty throttle body: A buildup of deposits can interfere with the throttle's operation.

* Vacuum leaks: Leaks in the intake system can cause the engine to run faster.

* Problems with the PCM (Powertrain Control Module) or other sensors: The engine's computer may be malfunctioning or receiving incorrect data from sensors.

* High idle setting (sometimes intentional): Some vehicles may have a higher idle setting for specific reasons (e.g., cold weather operation). This is typically temporary and will decrease once the engine warms up.

If your engine is idling at 1000 RPM, it's best to have it checked by a mechanic to diagnose the underlying cause. Ignoring the problem could lead to further engine damage.