EGR valves

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So, I got a question about egr valves. I originally just wanted to delete the egr and just plug the openings on the intake and exhaust manifold. But on further investigation I found out that the egr also helps mediate vacume pressure by allowing air (exhaust fumes) into the intake manifold when the throttle body is in the closed position, helping with rough idling. I do not like the thought of having exhaust fumes allowing carbon build up in the intake manifold and on the back side of the valves.So I am wondering if I disconnect the egr from the exhaust and just install a small pod filter, allowing the egr to still regulate air into the engine but no longer cause carbon build up, or does it need the exhaust fumes to run right? F.Y.I. no emissions test where I live