If you remove the plate from within the manifold, your exhaust gases will always circulate around the intake, heating the air and fuel entering the engine causing it to run poorly.
If you try to "disable" it's functionality by holding the plate in the hot position in Wes' photo, your engine will not reach operating temperature as quickly as it should *in colder weather.
If you're missing components I would recommend just repairing it. There is no adjustment once the components are assembled. If your assembly doesn't match the drawings, you probably have a broken spring, which can be easily replaced.
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