I drove a '73 Buick 225
Neither her son nor her husband could figure out what the cause was, so the car just sat. I offered her $150 for it, and she gave me the pink slip.
I quickly figured out that some knucklehead had turned the air cleaner housing the wrong way, which caused the throttle linkage to become stuck. Turned the air cleaner the right way, and bingo. No more 'demons' .. LOL. Paid a local shop to put a new front right quarter panel on it, and she was good as new.
It was a great car, until a drunk illegal plowed into it while it was parked.