On our way back to Seattle from a Colorado road trip our van (2011 2500 crew)started acting up. Really slow acceleration and popping and stuttering when on the gas at low speeds(25-30 mph). Barely got over the pass between Stanley and Boise, and went into LHM just as we rolled into town. We should up at the Mercedes dealer at 1:30 and even though they were obviously very busy, they got us straight in, diagnosed the faulty EGR valve, and we were back on the road by 5pm. A week later they called me and let me know that the repair actually was covered by an extended warranty on the EGR valve and I had a check in my hand for the full cost of the repair 3 days later.