If you are not using the idle air control valve (IACV) you can use the supplied 1/8th NPT plugs to block off the essential air ports.

You must install and tighten the plugs in the lower IACV section, as well as the two on the mounting face of the throttle body.

Make sure the plugs are threaded ALL the way in on the mounting face BEFORE mounting the housing to an intake manifold. If the plugs are not all the way down it can prevent a seal causing a vacuum leak.

Be sure to use teflon tape or pipe thread sealant on the NPT fittings and let them cure BEFORE continuing.

If you are NOT using the IACV, it may be necessary for you to adjust the throttle stop screw. REFER TO STEP 10 for more information.