Stalling 2015 GMC Terrain

I was trying to reverse from a parking spot at the store, my car stalled. I thought it was a fluke as I had no light come on, and it seemed to run fine from there. Then I pulled to a stop sign a few days later, and it stalled again. I pulled into my driveway at home and it stalled as soon as I pulled my foot off the gas pedal. My husband replaced the camshaft sensor and it drove and ran perfectly for approximately 48 hours, and now it is back to stalling again. I am becoming fearful that my car will stall and I will get seriously injured.

The electronic throttle body may be dirty.