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Typically, EGR systems are shut off when the engine is under very light loading (such as when the engine is at idle). They're also shut off at wide open throttle, in order to maximize power output of the engine at that point.
I would have to share razor02097's concern about your cooled EGR pipe actually sucking in oxygen from the end of the tailpipe. And is your idle air intake always "seeing" intake manifold vacuum, or does it only "see" intake manifold vacuum when you're not using the accelerator?
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