Egr valve

What is your question?

have a 2008 Ram 5.7 I’ve changed the egr valve twice now. It idles fine but when I’m drive it and let off the accelerator and it hits low rpm it starts like a bogey sound like it’s trying to burp or something. Once I hit the gas it goes away. Let off again and it’s back. If I unplug the egr valve it doesn’t do that. And yes I cleaned out the egr tube.