Of course, I “stutter” sometimes. I may stumble while attempting to say a word that my tongue doesn’t know how to produce precisely. For example, it can be a word in a foreign language. So when this happen, I just go to Google Translate app, type this word in and LISTEN to how it sounds several times. Then I simply imitate it with my tongue many-many times until the tongue gets used to this ONE UNCHANGEABLE way of producing this word correctly.