I have a sport with the forged 19" wheels, and I've found that the car is extremely sensitive to tire pressure. If it is a couple pounds too high (cold pressure btw) the car will seem to wander or drift in the lane at normal highway speeds. I dropped the pressure 5 lbs (found out I had a bad tire gauge...) and it was a different car - totally stable.
Get a good tire gauge and check the tires. Too high is just as bad as too low. The correct tire pressures are on a sticker on the inside of the driver door jamb.
Good luck!
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