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The regens are not getting hot enough to do the burn outs. With that and the hesitation you are experiencing, this is turbo actuator related.
The turbo is a VGT turbo and when the truck calles for a regen needed, the fins will adjust to give a different pressure out the exhaust by putting more air to the engine which makes the Catalyst hotter for a higher burn.
If you do a forced regen with the Detroit software and monitored the heat levels, I bet they are going to be lower than 1600 to 1800 degrees which is too cool for a good regen.
On the injectors, you can have bad injectors and still have a normally running truck because the other injectors compensate. The tips could not be spraying properly which will still give performance, just not good performance. Also wit the hesitation if the injectors are missing a spray pattern, since they multi spray, you could get hesitation that way as well.
I would do a forced regen on this truck and monitor the temps. I think you will find that the temps are too low and once you change the actuator, your temps will come back up giving a more normal regen cycle and the hesitation will go away.
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