I just noticed a sulfur like stench in the cab of my truck. Its really bad when it is idling. At first I thought I had stinky passengers, but later realized it was coming from the truck. LOL. Does anyone have any ideas what it might be?? I did just install an egr blocker plate a few weeks ago. could it be an exhaust leak? did not think diesels smelled like that though. and I thought my ECM tune turned the egr off.