Funny run on problem out of the blue / MSD

Dunno what it is yet, took a quick look and found nothing out of place.

Now this is my V8 car but suddenly today when I went to go get a plate sticker for the Firebird, the car would not shut off. It kept running for 20-30 sec on its own.

And yes it all wired right, has been fine for well over a year.
out of the blue for no reason type thing.

only thing it could be is it got jelous that I was getting a sticker for the Bird and it decided to act funny for more attention???

 

Oh and its not run on like the old days where a engine spit n sputtered to stay alive.

Its like the key is still on for 20-30sec.

mech fan, heater fan wasn't on, stereo was off, nothing in the system should be holding or making power to keep it going. But what it is like.