Since my recent rebuild, I have had a problem with the engine stumbling/dieseling for a few seconds after I turn off the ignition. I have figured this to be a wiring mistake of the mechanic, but hadn't gotten around to trying to fix it yet. Well, with the addition of a new stereo system it became painfully obvious that my alternator was getting ready to crap the bed. So, last night I put in a new alternator.......but this has had a worsening effect on my engine shutoff issue. Now, when I turn the car off, the starter starts cranking and will not stop until I disconnect the battery. WTF?! Any ideas would be appreciated.