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When was the EGR last changed out? It is a pain, but remove the indie cover in the cab at the engine box and drain the coolant down a little bit, then pull that EGR off. Soak it in mineral spirits keeping the black electrical part out. Use a gun bore brush and clean the soot off the EGR. Let it dry, reconnect, then see how it does.
The issue you are describing is a super common problem with a sticking EGR valve. It won;t throw a code, but it gives very horrible power. If you had a auto shift, you will feel like the gears are sticking and not shifting right. I do those EGR valves about 2-3 times a month and all of them do exactly as you describe. You will pull your hair out trying to figure out the issue and it always leads to the EGR being the culprit in this scenario.
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