This problem just started with my automatic transmission: when my car is going from a complete stop or from a speed under 5 miles per hour, it will not automatically shift into first gear, instead the engine just revves and the car barely creeps forward. I can manually select the low gear at a stop and it engages, at which point I can immediately put it back in drive and it will shift on it’s own perfectly. Does anyone have any idea what maybe causing this? Thanks for looking!!