I've posted here a couple of weeks regarding this problem. (02 Deville, btw) The car initially shut off at 80 mph on the highway, fastforward 2 weeks, and this has happened. They found the ignition switch fuse kept blowing. First time i went to pick up the car, the ignition started smoking, they changed the switch, drove it around, let it idle for an hour, everything was fine. Yesterday, I went to pick up (I thought) my fixed car, start the car, and after a couple of seconds, the fuse blows again. There are no codes, has anyone had a problem like this?