Hey there - driving out west in our 04 sprinter camper van. Was on the highway doing about 65, and all of sudden we heard a sort of poof sound (almost like the sound a semi makes when it’s about to take off, if that makes sense) and there was a puff of black smoke. Van started running poorly, and almost sputters when going from stopped to rolling slowly. No check engine light on. Just had turbo modulator replaced, glow plugs, egr valves before we hit the road. Was running great until this. Any thoughts? At the dealer now in Des Moines hoping they can help but just curious what it could be.