Not an erratic idle like a dirty throttle body gives you. That goes up and down when the AC compressor kicks on, and can send the idle down to 300-400 RPM and stall the engine out. Then it overshoots when the compressor cycles off.
death rattle. a sound produced by a person immediately preceding death, resulting from the passage of air through the mucus in the throat.
Death knell. A Death Knell was the ringing of a bell immediately after a death to announce it. Historically it was the second of three bells rung around death; the first being the Passing Bell to warn of impending death, and the last was the Lych Bell, or Corpse Bell, which survives today as the Funeral toll. [hide] 1 English tradition.