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Is there a testing procedure for the EGR or Intake valve? Is there a way to take them apart to inspect for worn parts? I know it is difficult to get to the EGR valve so I am going to remove and try to dissect the intake valve to see if it is the culprit of my problem. If anything clean it to insure there isn't carbon gunk causing it to get stuck.
The "intake valve" is actually an anti-shudder valve. The easiest way to test it is to unplug the connector and drive around. A CEL will occur, ignore it.

Unless I missed it, have you checked the MAF? Test it by using vcds or simply unplugging it and driving around.
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