Bro, when you are reciting the Quran like in rhyme (like singing), you don't stutter. Yes, If I don't rhyme, and recite it in monotone voice, I do stutter (but very rarely) When I was 8 or 9, while memorizing and reciting, I stuttered a lot due to the fear of teacher. But, it got better with age. P.S I also have blocks like I mentioned. But, I have a way to counter it (sometimes it doesn't work), like attaching a syllable in the beginning like when I say A, I append it with Y. It's not noticable. But there are some letters like M which don't have a way as of now (still finding it) 😁