jsensfuzzyhead

I have a 2000 Ford Focus and I bought it used. When I first bought my car, there were few things wrong with it. I was sitting outside one day with my keys in my pocket...the car started. locked the doors, A/c running and so was the radio. I couldn't figure out what was going on. I finally was able to use a spare door opener to get it unlocked, but yet it turned off by itself. I thought nothing of it after awhile...until yesterday it did the same thing. Just started right up. I couldn't drive it anywhere...but I put it in reverse and sure enough the car slowly started to back up...I was on a hill. I put it in park..but yet it turned itself off. So now I don't know...has anyone else had this problem before?