I found this in another thread.
someone thru some crap autostore plug wires on it, and there were a couple ends that wouldn't "snap/click" onto the end of the plug right. In fact, when i went to look at the car, the owner before me said it had a miss. I looked, saw the new "junk" plug wires on it, and snapped the one end on the plug, it cleared the miss up. Then a few days later, same thing happened under my ownership, plug wirecomes off the spark plug.
I'll recheck the plug to boot connection and visually check for spark again.