Transmission light on/ car is running hard while idling & choking feeling.

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Transmission light on/ car is running hard while idling. While driving is feels like it is choking out and starts shaking and sputtering. When give is more gas while driving the transmission light will start to blink. Everything was fine with the car prior. Didn't drive hard or anything as well. Could is be a bad batch of gas? Need help! Thank you!