[cardoc]

Your car has electronic throttle. Drive by wire. The motor that operates the throttle plate also works the plate for idle air control.

Its still most likely carbon buildup throwing off the throttle position data sent to the ECM, just its the carbon on the throttle body.

It can be cleaned with a soft bristle tooth brush and the proper cleaner. You can pick up throttle body cleaner at the parts store. Don't use carb cleaner. Get the cleaner that's safe for electronic throttle bodies. CRC is a good brand.

Disconnect the battery prior to cleaning and make sure its dry before reconnecting the battery and starting the car.

 

[cardoc]

You can clean it on the car. The throttle plate can be moved by hand to get the area in front and rear of where the plate rest closed. If you want to remove it, its one plug, 2 clamps on the coolant bypass hose and 4 fasteners. The gasket should be reusable. Removal would make for a more efficient cleaning and make it easier to get the interior side of the throttle plate.

Either way, make sure it is dry before you turn on the key and put power to it.

There is not an IACV on your car. Its all managed by the motor assembly attached to the throttle body on the passenger side.

 

[cardoc]

You will only find the gasket at Subaru.

If this doesn't solve the issue, then you'll have to look into the type of fuel used, fuel delivery or clogging exhaust.

 

[cardoc]

Out of interest what should the resting idle be?

About 700 in park.

 

[cardoc]

Without a scan tool that reads live data, you'd have difficulty testing all the circuits. With a scan tool that will read the data, you compare throttle position with the pedal position in relation to the target idle. You would also look at HG measurement, AF sensor data and rear O2 sensor output.

High alcohol content fuel will cause a low idle in cars that are not programmed to adjust for it.

 

[cardoc]

@FSUguy If your engine idle is low, first check is for codes on the car. Is the engine light or other lights on? No codes, clean the throttle body with the battery disconnected and when you're done cleaning, hook the battery up, turn the key on, don't start, let it sit on for a few seconds, the gauges will sweep, then off, then start and let it idle for about 5 minutes. Drive it around the block and see what it does.