The chatter may actually be the tumble flaps on your intake manifold. Mines was making similar noises until I got mine replaced. But yeah, there is a bit of vibration on warm up with mine too, I wouldn't worry about it too much.
Originally Posted by matmatician
What spare tire? The one that adds weight? Psh. Its wherever my A/C is.
ROTM June '13, PNW Crew #42, SR #245, Rally Rev #02