I have a metaphor for this kind of disfluency - the holding breathe part of it. It’s like pushing against a wall but because physics we know that the wall pushes back with equal force. There’s a thought in our head that the wall in front of us and the wall behind us are closing in closer and closer to each other (like in Star Wars). To escape it though we have to slow down, I saw another commenter say this. I understand that inhaling can put more tension on the vocal folds but the trick is allowing our words to come out in sync with the breathe going out, and to relax each part of our mouth that is responsible for each sound and syllable. It takes practice to prepare for situations when we hit that wall but habitually speaking gently will higher the likelihood of adapting to a moment of stuttering, rather than reacting to it.