1992 Buick Skylark Q&A

1992 Buick Skylark Question: My car is starting without the key in it why

I stopped to get gas and when i got in to start my car it would not start so I took out the key and all my lights in the car started going off. When I got it jumped it wouldnt start with the key in it but when I took the key out it tried to start on its own 1 time then the second time it started while I had the keys in my hand and it wouldnt go off I unhooked the battery but it kept running then I turned on the air and it went off? Please help my mechanic doesnt even know what is going on????? -
Answer 1
DOES YOUR KEY HAVE A LITTLE BLACK CHIP ON THE SIDE OF YOUR STEEL PART -