As I was reading along, EGR physically stuck open or the EGR position sensor stuck would have been my first guess after eliminating the Torque converter clutch by shifting to neutral. The position sensor sits on top of the EGR valve on those trucks and can be purchased separately. Easy to change and cheap to buy. If your code was for a position sensor specifically, I would just replace that first. If it was for a flow problem, then take the valve off and investigate further.
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