I have a problem that I haven't encountered in a diesel truck before. When my truck idles it gives off a nasty rotten egg smell. It leaks into the cab from any opening like the vents or an open window. It goes away once I start moving, and most likely because I am moving. What in the Holy Lord's Sacred Name is this and what's causing it? It just started at around 90k miles. And if you have the answer, please be gentle. One more dealer only part/fix and I may just puke. Thanks for anyone who can help me.