For the past few years I have owned a 2013 Subaru Legacy and a 2015 CR-V EX. I occasionally noticed severe stumbling and hesitation on both cars when I would try to accelerate from a stop, or when maneuvering in traffic. I read in another forum about using left footed braking causing the engine computer to get confused when stepping on the accelerator pedal and brake pedal at the same time. Sure enough, my habit of left foot on the brake pedal was causing this for me. I've had to change driving habits, and it's right foot on the brakes for me now!