My '82 240D will not stop running when you turn the key off. I have looked and all the vacuum lines and they seem to be connected. This just happened one day out of the blue. I have to use the stop leaver to kill it. I'm guessing it’s a vacuum line some where but I don't know where to start. I purchased a MityVac hand pump today and need some direction on where to start. I don’t understand how the vacuum system works. I hope someone can give me step by step on what to do first, second, and so on so I can get this problem fixed. All the doors lock and unlock with the engine running. With engine off you can lock the doors once but they will not unlock until you restart the engine. This has been the case for years but it has never kept running when you turned the key off. It's driving me CRAZY!