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see my post on 6.0 coughs at 70 mph, up hill,which is about 2K rpms, this prob originally presented itself while I was loded with my 13' sunline truck camper, dealer replaced center sec of turbo, still same problem, was told here on site that egr could be problem, ford tech checked all pressures etc on the computer tool, all good, one thing was found, clogged exhaust recirc tube, there is a an advisory on this. this was replaced, as was the egr valve, problem went away, and truck runs great, this is a little prob that can cause the same symtoms as you are having, I am not positive that egr was bad, but we know the tube was clogged, good luck.
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