I have a 2015 Santa Fe Sport with 36,000 km that I have owned since new. Back in April, when I put my foot on the brake, it was lunging. I took it in to my local dealer and of course nothing coded on a diagnostic. They could feel the lunging but said nothing showing. My thing was this is not normal and it was lunging quite bad. I explained years ago we had a Ford doing that and they had to dump the computer and reload. They did this and it stopped the lunging. Since then, I have a very rough idle which sometimes has me putting the vehicle in neutral when at a red light. It only occurs after the vehicle is warmed up, but one thing I noticed is when the air conditioning is on, the normal draw down on the motor has gotten a lot worse. I took it in to dealer yesterday as it was due for inspection and they advised like the first time when it was lunging, nothing showed in the diagnostic codes. The service manager, said this is normal, though I have owned this vehicle since new and never had this issue, then said it was the weather, then said maybe when they re-coded the computer it was a different update. What I got from all of this is that they have no clue. When the air conditioning is on, the idle has gotten so rough you almost think it is going to stall out, so I put it in neutral to try and lesson the load. Something is not right....any ideas??