Air valve
 

Hey Guys,
Do any of you have an adjustable valve inline that controls the idle of your engine? When it is fully open my engine idles around 1200rpm and when set low it idles at 800rpm.Does anyone know the reason they would add this valve ?It was added off the driver side intake ,but I removed it because it seemed to me to be there for nothing. My idle does seem to go up sometimes up to about 1500 and goes back to grand or so a few seconds later.

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