have a 87 cutlass with newly rebuilt olds 455. the car is still being reassemble. so every couple week i'll start it to help keep the lifter pumped. doing one of the start up i just so happen to turn on the head light /parklight switch.. i don't why i did that , but when i turn the ignition off the engine keep running. first time that happen so i turn light switch off ,turn key to off and the engine shut off this time . i must add the dash has been completing removed. actually the cars inside has been guted waiting on the new interior. wondering if their may be a wire touching. don't know which wires i'll be using when i reinstall the dash. any ideal where should i start looking. i'm sure after some trouble shooting i maybe able to fine the problem, just trying to save myself so time.