Okay. You are on the right path with the EGR. Normally when putting a vehicle in gear and it runs rough it is related to the EGR. Since the valve is new we need to remove it again and look at the inlet and see if there is carbon or it is dirty. We need to make sure the passage is clear.
Then we need to monitor the o2 sensor data and see if it is lean (as I suspect) when you put it in gear. If you don't have a scan tool, try spraying a little starter fluid in the intake when it is running rough. You will need someone to sit in it while you do this so they can hold their foot on the brake or lift the drive wheels so it is safe.
Once we know if it is rich or lean when running rough we can make the next decisions.
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Monday, March 9th, 2020 AT 6:02 PM