stammer out
To utter something in a hesitant, halting, or stuttering manner. A noun or pronoun can be used between "stammer" and "out." The assistant stammered out an answer to the boss's question. The poor child has a very severe speech impediment. He can barely stammer his own name out.
stammer something out
to manage to say something, but only haltingly. Fred stammered the words out haltingly. He stammered out the name of the winner.