I think I bought a lemon
I bought this 2005 ford Taurus like 3 days ago. It was fine at the dealership and
the last few days but its knocking and like stalling and I have no clue wtf to do
Check the oil first to see if it is full. If you bought it a dealership, did you get a warranty? Decent dealerships have a 30 days warranty. Some cars are sold As Is. Since it's only 3 days, contact the dealer with your concern and hope they will help you with the issue. If not, I suggest having a mechanic look it over.