This study investigated the association between speech sound articulation and childhood stuttering. No significant differences were found between the articulation scores of preschool-age children who stutter and children who do not stutter.
Clark, Chagit E., Conture, Edward G., Walden, Tedra A., and Lambert, Warren E. (2013). Speech Sound Articulation Abilities of Preschool-age Children Who Stutter. Journal of Fluency Disorders, http://dx.doi.org/10.1016/j.jfludis.2013.09.004