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I have a buddy that his excursion is acting up. If your driving down the road it will start missing out kinda chugging, if you lay into the pedal it will smoke like a train and start to line out. once it blows out all the smoke its seems to run fine. He knows his first problem he has an edge on it. I drove the truck and it seems under powered but I have a 6.4 so I dont know. He just took it to a local shop and they done an egr valve and something else. Any ideas
 

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This sounds like a EGR valve sticking open, most likely from carbon build-up in the intake passage and EGR cooler. If the EGR valve was replaced without replacing the EGR cooler and cleaning the intake passages carbon can still get stuck in the valve causing the condition you are describing.
 
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