Vehicle Compatibility Information For Dodge Attitude 1.6L 2012-2014 For Hyundai Accent 1.6L 2012-2019 For Hyundai Veloster 1.6L 2012-2017 For Kia Rio 1.6L 2012-2018 For Kia Soul 1.6L 2012-2019 Symptoms That Indicate You Need A Throttle Body Replacement Vacuum leak Poor or high idle Replace throttle body The throttle body is the part of the engine that mixes air with the fuel to allow combustion to take place. There are a number of symptoms that are often due to a failure in this part, including repeated stalling for no reason, problems with responsiveness of the acceleration pedal and stumbling or hesitation whilst accelerating. .