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I'm not sure if that gen had it, but it could be clogged EGR passages or a bad EGR valve.
[Edit]: Duh I didn't read you said you already unplugged the EGR. I had this same exact problem on my HX (the loss of power and then it just gives up and gives me my power back). I never found out why before I sold it. Cleaning EGR plate, replacing air filter, spark plugs, wires and changing oil did help a lot. Not sure which one help, or a combo of all of them but Yea.
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