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.
As the death rattle does not always respond to these interventions, Bennett conducted further research into this phenomenon and came up with the conclusion that there is more than one type of death rattle. Physiological Theory: Causes of Death Rattle. Bennett (1996) identified two different types of death rattle. Type I is caused by an accumulation of salivary secretions when swallowing reflexes are inhibited and type II is caused by an accumulation of bronchial secretions in patients too weak to cough effectively (Bennett, 1996).