I’m on the autistic spectrum and can say I definitely believe there is a connection to stuttering. We often have a difficult time with emotional processing, as well as being more sensitive. As well as can struggle to formulate words we deem are socially appropriate for the situation. This can lead to stress and an overcrowding of various sentences that are all in our head, as we try to sort them before we choose the best one. This can lead to competing intentions and clogging our mind, causing blocks. As well as Autistic people often have a difficult time defining themselves. So their lack of being in touch with themself gets them all out of sorts with their self in social situations.