Hello, I have a 1997 gmc jimmy it has 167,000 miles on it and I have a problem with at random times when the suv is parked and locked no key in the ignition it will crank over continuously. I changed the ignition cylinder about 6 months ago. I just recently changed the battery and starter. It still does this and it will do it til the battery is dead so I have to disconnect the battery at night when im home. Please help me with this problem thank you.