2015 Subaru Outback - Stumbles

Stumbles several times taking off from a stop

Is the check engine light on?

No check engine light. Car takes off from a stop, goes 10 ft, engine goes to idle for 3-5 seconds, with no throttle response at all. Then throttle response returns and the car takes off. This can happen just once, or it can repeat 4 or 5 times. Once speed is above 20 mph, there is no more problem.