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.
CNN PRODUCER NOTE. This rattle snake was killed in spruce pine alabama 8/8/210 the man holding the snake is 6 foot 1 and as you can see this is the largest rattlesnake I have everseen maybe even a world record it had 28 beads and a botton.