Mine did, and still does. It's not that often, but noticeable;
and I'm guessing it's bad actuator shorting time to time;
try this and see if you have any code:
http://www.grandprixforums.net/f81/9...hack-6429.html
I wasn't able to reproduce it when I wanted to,, so if you CAN reproduce it if you want to, like by pressing on brake pedal, I'd guess that'd be a bad battery.
at least mine did it and it was bad battery;