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.
For other uses, see Death march (disambiguation). A death march is a forced march of prisoners of war or other captives or deportees with the intent to kill, brutalize, weaken and/or demoralize as many of the captives as possible along the way. It is distinguished in this way from simple prisoner transport via foot march.