on top of the throttle housing,will have a grey top!if u not sure where that throttle housing is just follow the throttle cable to the inlet manifold you will see it there,the adjustment screw is on the throttle body but at the bottom of it!u need to get the engine hot unplug the iscv then adjust the idle speed via the adjustment screw to around 800rpm then reconnect the iscv if you got it set up right the idle speed should not move