TL* THE CONTACT OWNS A 2013 HYUNDAI SONATA. I JUST DROPPED IT OFF AT POHANKA HYUNDAI (1770 RITCHIE STATION CT, CAPITOL HEIGHTS, MD; (301) 423-1100) DEALERSHIP REGARDING ISSUES I SUSPECT TO BE RELATED TO THE RECALL ON THE ENGINE. ABOUT THREE AND HALF WEEKS AGO, I STARTED EXPERIENCING THE FOLLOWING SIGNS UPON START-UP IN THE MORNING AND DRIVING THROUGHOUT THE DAY. A LOUD KNOCKING SOUND AND VIBRATION FROM THE ENGINE FOR 3-4 SECONDS WHEN I START THE CAR IN THE MORNING. HEAVY SMOKING(MORE THAN THE USUAL MORNING SMOKE ON COLD DAYS) SOMETIMES UP TO FIVE OR MORE MINUTES. ACCELERATION AND RPMTHAT DON'T PASS 2000 ISSUES WHEN DRIVING AT 60 MPH. RANDOM AND INTERMITTENT STALLING WHEN DRIVING, SOMETIMES ALMOST COMPLETELY STOPPING OR REFUSING TO MOVE AFTER A MOMENTARY STOP. THE MANUFACTURER WAS MADE AWARE OF THE ISSUE. THE APPROXIMATE FAILURE MILEAGE WAS 169,925.