try bump starting the car, if it starts its probably not the vats, but if it doesnt start, then it probably is the vats. with the security light flashing, it is a good possibility it could be the vats, i know on my wifes pontiac that you have to leave the key in the on position for about ten minutes (until the security light stops flashing) then the car will start. i dont know if the f-bodies were the same way or not (wifes car is a 2001). basically the computer has to re-learn the key in the pontiac every now and then. i dont know why it does it and im sure its not supposed to, but now and then you have to in her car.