Whenever I am idling at a Drive Through, and let go of the brake and let the Veloster roll forward, it starts to stall. I have to give it gas to keep it from stalling which can be exciting when car is in front of you. I replaced the Spark plugs a couple of times with NGK and Bosch Iridiums. I replace the Mass Air Flow Sensor. Each time the stalling went away for a few days and it eventually came back. Almost as if the computer adjusted for something to keep it at a certain value.
there are no Check Engine lights ever. Does anyone have any ideas on what could be causing this? Thanks!