Just got the car last month, only 1200 miles, check eng lght came and track off on 2012 Lexus RX350

before the check eng light came up, i was driving and it felt like engine stopped and then turned back on, it was almost like some one hit me in the back, but no one did, and now it makes some kind of noise that was never there before. very concern.

Asked by for the 2012 Lexus RX350