I have a '97 DeVille which has developed an odd and potentially deadly problem. Sometimes on hard acceleration the drivers seat begins moving me forward into the steering column and won't stop until it reaches the full forward position. I can't override the movement with the seat control switch. This is very unsettling because I'm 6' and it compresses my legs under the steering column. When this happens it is usually at the worst possible moment, when I'm merging into heavy traffic. The car has 114k on the odometer. The drivers side rear window also stopped working from the driver's console but can still be put up and down from the rear door switch. The window stopped working when I plugged my new GPS unit into the cigarette lighter one day. 24 hours later the window quit working. The turn signals also occasionally stop working in mid click for no apparent reason. If I didn't know better I'd say the car was haunted. I suspect a computer software error and want to reboot the CPU so the firmware reloads a fresh copy (a friend suggested this) but I don't know the protocol. Any ideas anyone? I really like the car and would hate to have to junk it because of this.