Did I say you were old? :-)
A trick from when I was very young: There was an ongoing ‘feud’ between my older brother and this jerk in the neighborhood. Mr. Jerk had a very nice clean ride: ‘56 Chevy, (if memory serves). My brother put a ping pong ball in his gas tank. Causes no issues until the tank is low. Kills the engine, engine restarts, then dies again as the ball blocks the suction to the fuel line. Mr. Jerk went nuts trying to figure it out. He eventually sold the car to a friend of my brother, who knew what the problem was.
Did I say you were old? :-)