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.
Canebrake / Timber Rattlesnake (Crotalus horridus) - Venomous. Description: Timber rattlesnakes, which are called canebrake rattlesnake in the Coastal Plain of the Southeast, are large, heavy bodied snakes with the characteristic rattles on the end of the tail. Adults range from 30-60 in (76-152 cm) with the record being more than 6 feet (183 cm) long.