diesel run on, and on, and on.

[shoemechanic]

I recently inherited a 93 300D 2.5 turbo from my grandfather. I am interested in anyones help in diagnosing this problem: The car does not stop running once the ignition is turned off. Also, the stop lever on the injection pump looks out of position (points up more than before) I think it might have something to do with the engine shutoff vaccuum motor.(?) Once the key is turned off the engine idle decreases slightly. I have been looking for publications on repair manuals and have found none. I would also like to reap the bennefits of maintaining this vehicle on my own, if it permits. Help?