New Member, New Duster

take off air cleaner and there should be a metal flap thing that stops air into carb. Possibly it has been removed.
When car is warm it should be open. Pulled by a rod...
Possibly the choke has been removed or wired open. Common

How much rev do you need to put into it to keep it running?

Power brakes? if so remove that hose and plug it also just to check if that's source of a vacuum leak

So it was running fine for 1 day and then the next day it just started acting up.
Guy who sold it to you have any ideas or advice? He likely was aware of something, maybe