A few questions
My 2013 Hyundai Elantra has developed a problem. There is a noticeable miss (or bump) when the car is in idle reverse or idle forward. It is worse in reverse. When you slightly rev the engine the problem goes away. The car has about 40,000 miles on it.
Does this sound like a fuel system issue (e.g., fuel pump or fuel filter) or a transmission issue?
I will warn you that once I get some direction I will probably ask some more questions.