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.
The timber rattlesnake is a large snake, averaging 80-122 cm (31.5-48 in.) in length (Oldfield and Moriarty 1994). It has a broad, triangular-shaped head and narrow neck, a distinctive barred body pattern, significantly keeled scales, a gray to tan rattle with 1 to over 13 segments, and a single anal plate.