I've noticed this a few times and was wondering if anyone else has. When I first start the car and start going in first gear I can feel something mechanical vibrate or move the throttle pedal very slightly once or twice and then it seems to stop about the same time that the doors auto lock. I also seem to notice it more if I reverse out of a parking spot first and then go into first and drive away. Is this normal? It doesn't feel like anything is wrong just like one or two little buzzes in the pedal. It only happens right after starting the car.