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Definitely sounds like the EGR cooler is clogged, and possibly the EGR valve clogged. These would lead to both bogging down, and overheating. Take it to a diesel mechanic and have them bulletproof this motor. This engine when running properly can pull 2x what that Tundra can pull while getting 50% better gas mileage.Report it
The lack of power and overheating is probably due to the radiator cap not holding the pressure. The Ford factory part is inadequate, a new one can be purchased from Advanced Auto Parts for $5 with a stronger springReport it