Excuse my english, first of all it's a second owner car so I don't know the previous owner treated it...
I have changed the low beams of the front lights twice since I bought the car.
It has a nervous idle, it goes from 800RPM to 1200RPM. After a hard run, the engine hesitates with a gentle throttle response, but responds well at full throttle?
Squeaks and rattles all over the place, especially from the cockpit and sunroof area, squeaks from third door (I solved this problem once by putting grease or silicon into the rubber bushings that make for a tight seal).
Strange clack, clack, clack from the direction in pavement with expansion joints.
At high speeds when you use the brakes it makes a rough sound until you depress the pedal and give them a while for cooling himselves again.
Poor refined power delivery and a second gear failing synchro under 6500RPM powershifts.
Well tuned suspension, on the soft side of sporty, good looks, great interior space, nice ergonomics (driver oriented, reminicent of a little Supra inside), good acceleration (0-100KPH in about 8.2 secs), I tried myself with a 215KPH top speed, good stability, good airconditioner and good price when introduced, the second generation cost about US$ 15,500.
This car can go head to head with much expensive cars like Honda's Civic V-TEC (127HP) and Volkswagen GTI (115HP). With 136HP on tap it revs pretty well, but for its size and weight it needs a 2.0L with at least 170HP to achieve the performance to match its agressive stance.
Had the same idle problem, your Hyundai dealer can fix it in less than 5 minutes. Or you can do it youself, it's this simple... remove the positive lead from the battery. This resets the computer to the factory default, it should idle at around 900 rpm after this.
Blown oxygen sensor?
No, damaged TPS rather.