Toyota 1999 Corolla,low idle,my corolla idles at

That is normal. What symptoms do you have?

That is most likely caused by the Idle Air Control solenoid.

A manual transmission is about 400 RPM and and automatic is about 700. When you put the automatic in gear it will drop by about 200. When the engine is cold you can be about 1100.

IDLE SPEED COULD BE TOO LOW.IDLE SPEED SHOULD BE 800 RPM. IF IDLE SPEED TOO LOW AND ENGINE NOT WELL TUNE UP AIR CONDITIONER WILL PUT LOAD ON ENGINE CAUSE ENGINE OVER HEAT AND SHUT OFF.

air leak.check your hose to the servo.

idle air control valve can be removed and cleaned

Idle is factory set and cannot be adjusted, your best bet is checking for cracked hose pipework for air intake at idle,(not at problem under exceleration and driving) Any slight upset to the air /fuel ratio will be most prevelent at idle speeds.Check hoses where the meet metal flanges on manifold intakes and any sharp bends in ppipes.Good luck

you need to replace the throttle position sensor on the intake.

If you dont have any trouble codes, this usually occurs when the idle air control valve (IAC) is going bad.

That is normal. When you put it in gear, the idle speed drops about 400 rpm.