Stuttering only under anxiety?

Stuttering only under anxiety? Hi, Is it possible to say that we stutter only when we re under stress? When we re angry, sad or excited? I dont have a BIG stuttering problem, i d say on a range of 1 to 10 i m a strong 4 but its still so anoying... What i noticed with me (well when i joined college) that i stutter only when i m under some emotion (rage, sad, strees etc) and when i m not (when i dont think about stuttering or when i m "bored") i dont stutter on one single word. I ve also noticed when i try to speak as slow as possible i cant stutter at all while when i try speak faster i start stuttering on lets say every third or fourth word. Someone feeling the same?