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.
A rattlesnake is a venomous pit viper with a rattle on it's tail. a highly venemous snake native to north, central, and south america.It can grow very long. One out of every one thousand rattlesnake bites is fatal, and even then the person was probably allergic to the venom.