ok, this isn't like some life or death for my car question, but i am curious. start your car (cold motor, might work warm, but never tried it). Sit there and watch your RPM on your tach. While still on a cold motor, turn the steering wheel this way and that. as you turn it, did you notice your rpm drop, and hear the valves reset? when you stopped turning it, did your rpm go back to normal warming range? why does it do this? (leave your E-Brake up, so you're not moving, of course).