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Message: [QUOTE="Brickman, post: 1036516, member: 14965"] Did a ton of research and still not convinced what it is. Here are the symptoms: Bad fuel mileage, low power, high egt and rough idle. Gets worse when warm. When it downshifts pulling a trailer the egt's skyrocket and I get a bunch of black smoke out of the exhaust pipe. This is at high boost levels of around 26 psi. Truck started to stumble and die. Engine would cut out and then catch again. The stumble is much worse when warm and the truck is idling. Does it really bad on a 80 HP Tow Tune from DP-Tuner. Switched to stock tune and the stumble stopped. I scanned it with AE and no codes. Ran a buzz test and all of the injectors sounded really good. ICP pressure looked good and so did ICP voltage. Did not get to run a WOT test on the IPR as I was short on time. Oil has 1000 miles on it and fuel filter had about 7000 miles. Truck has 173,000 miles. ICP replace 60,000 miles ago. IPR is original. CPS has about 20,000 miles on it and is the dark blue version. I do have a up pipe leak but it would not cause the stumble and rough idle. Where do I start as I have to use the truck again this weekend pulling a 8,000 lbs trailer and don't want to get stranded? Thanks. Mark [/QUOTE]

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