It would be worth having a mechanic check it for you. It could simply need a tune up, new plugs, plug leads, clean of the throttle body, or idle adjustment.

Try adding some fuel system cleaner to the fuel the next two or three times you refuel. If that doesn't help, have the throttle body cleaned.

We test all cars in the real world, on the toughest corners and worst surfaces we can find, and I've been doing the job for nearly 40 years. Hyundai has focussed its suspension work on European-style handling, not a cushy American-style ride, but that's no different from many other brands. For your needs I would probably have steered you to a Nissan Pulsar, but also advised not to buy anything without a proper test drive on road you know.