Toyota Kluger 2014: Struggling to accelerate

For the past month my 2014 Toyota Kluger has been struggling to accelerate. The gas pedal becomes heavy before the car struggles to accelerate, jerks then stalls for a few seconds before it kicks in for a few seconds then repeats the motion. These inconsistencies have been happening for a month now and are intermittent. Do you think it could be problems with either the engine or throttle?