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Idling on 2008 Toyota Corolla

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
What do I need to do to improve the idling ? It doesn't idle as smooth as it should.
(1) Answer
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It depends on how many miles your engine has on it. It could be due spark plugs, this engine has shim adjusted valves which people forget to check periodically the valve clearance. The throttle body may need to be lightly cleaned with chemtool around the throttle butterfly. You should check that you have no vacuum leaks around the air intake boot or intake manifold. Perhaps have a scantool attached to see if there are any codes or pending codes stored in the computer of your car and if any of the sensor values appear to be out of range.