"someone that's not me" 😉 has done acid many times and also stutters. He found that depending on the set and setting it had a different effect on fluency. When taken at home with a few good friends, his fluency was really good; however, when he took it at a music festival and didn't really have a great trip, his fluency was really not great and he had a hard time speaking. Just make sure that you're tripping in a good environment with good people and you'll be good.