Sounds like your EGR valve is sticking open slightly to me, but it could also be your relay. I seriously doubt it's your module. They go bad from heat, but they tend to function more like a light switch; either on or off. You really need to duplicate the problem and see what the pressure does. If it dies, it's your relay.
You could also disconnect and plug the vacuum hose to the EGR and see if that makes a difference. if it does, replace the EGR.
Take care,
~Chris
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