puttered

/P AH1 T ER0 D/
verb
  1. 1

    To be active, but not excessively busy, at a task or a series of tasks.

verb
  1. 1

    To produce intermittent bursts of sound in the course of operating.

Source: https://en.wiktionary.org/wiki/putter, https://en.wiktionary.org/wiki/puttered