stutters, sputters
Sie stottert schon weniger.
She stutters less now.
— Mommy (2014)
Tom stottert, wenn er nervös wird.
Tom stutters when he gets nervous.
Der Motor stottert.
The engine is sputtering.
— Hass (1995)
Er stottert.
He stutters.
Sie stottert.
She stutters.