Car stalking when stopped, chuggy

What is your question?

Had gotten gas other day at different place. Following day car was chuggy, added more gas at my usual place, car still chuggy, stalls at lights when stopped or Chugs like it's going to stall. I thought it might be bad gas from the previous day before now not so sure. Any indication on what it mite be. Has chugged before previously but never to this extent where it stalls.