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He adjusted your throttle cable to speed idle? That’s not the way to do it, that just means your throttle is being opened a bit to let more air in
 

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Are you sure that is the right picture? There are two adjustment screws that look like that on the throttle body. That is the upper one, and the lower one controls fast idle. It is common that the tab that holds the lower screw gets bent overtime and causes a low or rough idle.
 

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2003 Nissan Xterra Se Super Charged, auction project. It needs some love. Manifolds both
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Hey that's the throttle stop screw. That screw to keep the vehicle from stalling on decelleration and preset from the factory.
 

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There are two proper idle controls. The first is on the adjustment screw on Idle air control valve on the backside of the upper intake. You can twist the idle screw and alter the RPM at idle. You can also control the idle to a degree by slightly rotating the throttle position sensor. You can also adjust it slightly by the distributor advance. There is an order of setting these things but I think they end up with adjusting the idle screw on the IACV.
 
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