Cyl.2 Misfire Detected

i did buy a 2006 passat 3 weeks ago, yesterday morning while i was driving the check engine came on, i took the car to the dealer service, and they said that a DTC IN ECM CODE P0302 SMALL LEAK DETECTED SMALL LEAK DETECTED --CHECKED VACUUM LINES -- OK -- PERFORM OUTPUT TEST PLAN -- ALL PASSES -- CLEARED CODES IN SYSTEM....I would like to know what all that means.....and why in a new car with 1587 miles. thank you