I have a 2.0 2015 elantra. at high speeds 70/75 there has been a shuddering that goes away as soon as you lower the speed. the first 30-50 miles no problem at any speed and then it happens. the last trip I couldn't go over 60 without the shuddering. I just got 4 new tires and wheel alignment and still the same problem. there are 48,000 miles on the car.