Shaking at idle??

I have noticed, in my 2012 Elantra with 32,000 miles on it, that my car is shaking at idle. I'll be at a red light or stop sign and the vibration is SUPER annoying. I have had it tested at a Hyundai Dealership. They couldn't "replicate the problem" and nothing it wrong with my car.

I may be trading this car in for the Veloster Turbo. I'm tired of how slow this car is. I know I sacrificed speed for gas mileage, but I have a question, has anyone else experienced this problem, and does the Veloster have this problem as well?