Bummer on the emissions fail. Not sure if I'll have any time coming up this week or weekend, as I'm already committed to a few other projects, but I think you're right on track with the EGR. Unfortunately, most of the tests in the FSM require a hand held vacuum gauge, which isn't currently in my arsenal of tools that I've been acquiring over the past few months. The OEM EGR valve is just under $96.10 at mitsubishiparts.net, and $86.79 at Rock Auto. A lot of vacuum lines in the EGR circuit, so maybe a quick 5 min check of those would be in order. Hopefully one of the other guys can come by though.