CAR JERKS UNCONTROLLABLY WHEN PROCEEDING FROM ANY STOPPED POSITION.. THE CAR JERKS CAUSING GREAT POTENTIAL FOR A FATAL ACCIDENT. IT ONLY HAPPENS ON HOTTER DAYS.. RIDICULOUS KIA DEALERSHIP IN THORNTON, CO WANTS ME TO ONLY FILL THE TANK UP HALF WAY TO AVOID THIS PROBLEM, THIS CAR IS UNDER FULL WARRANTY & WAS ONLY 3 MONTHS OF USE BEFORE FIRST REPORTED PROBLEM. THEY CALL IT "VAPOR LOCK" WHICH SOUNDS RIDICULOUS.. IT ISN'T VAPOR LOCK. *TR