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Well 5 years ago today I bought my truck and 85,700+ miles later its still going strong no major problems as of yet just the EGR valve PO402 code has been the only big problem so far.
Change out the DPFE sensor(spelling). It's the sensor that detects how much flow the EGR is putting out. The sensor goes bad due to heat and condensation. They are on their 6th version of it now and I haven't had a problem with mine.