I have a 2006 3910 with the ISL 350 and I don't see any problems with it being sluggish. The Cummins ISL engine series is a work horse in the trucking industry. Diesels are not fast, but they are powerful and on a long climb up a steep grade they will leave most Gas rigs in the their dust. As for as ride, I love my Spartan Mountain Master chassis. It does ride and drive like a luxury car.
Sounds to me like it needs to be laser aligned and ride height checked out. If the ride height is too high then the suspension has too much air in the air springs and will make a rig ride like a buck board. I also went from Bilsteins to Koni FSDs on the rear and adjustables on the front. What a difference in ride and handling.
Sorry to see that it was a no sale but your doing your homework. I would never purchase a new or used rig without getting the creeper and coveralls out and spending time underneath.
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Craig & Carolyn Roberts Apple Valley, CA
Toad: 2017 GMC Canyon 4X4 Crewcab
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