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Hi my name is Robert....
I would not try to drive this if the engine sounds like a bucket of bolts, you can cause more damage and would not be worth it. It sounds like something is going on with the DPF system . What the shop will do is hook up to your engine computer and see what faults are active, the Cummins software will walk the tech. through the troubleshooting for whatever codes are coming up. In the long run having the codes pulled saves time and money and will take the guess work out of what fault is occurring. I do know if you have a fault with the DPF system and you try to drive the unit you can cause damage to the engine so I think the best course of action on this would be to have it towed and then the fault codes pulled. Robert