When ever you buy a new car
you should always do the maintance right away .
Meaning change
oil+filter, tranny fluid ,coolant,pcv valve ,plugs +wires+cap +rotor.
Then do a motorvac and a compression test before even driving the car.To make sure everything is in perect shape first.
Extra stuff is timing belt ,brake pads, all bulbs,rustproof and detail it professionally.
What of those things have you done already to rule them out?