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Dave,
A few things to consider:
(1) Replace the fuel filter. You did not state how many miles are on your truck, but a dirty filter affects shifting due to loss of power and is felt more in tow/haul. 15k is about the life of filter (many variables impact this), but if you picked up bad fuel recently try draining the water from the filter. Follow the instructions from the owners manual.
(2) Any codes? You will need a scan tool that reads engine/body control/transmissions (such as OTC genisys). Advance Auto cant do this.
(3) Reference the miles, did you service the transmission at 5k and again at 25k (if applicable)?
Let me know the miles, whether the fuel filter was indeed changed recently, and if you have any codes and I will try to help. I am also on the diesel place.
take care,
Joe
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