This morning while passing an 18-wheeler I went from 60 or so to 75 using mid-throttle. My car suddenly felt as if the ignition had been cut on and off a few times quickly. I looked at my turbo boost gauge and it was pegged! I have never had that happen before. Funny part was, I was only at 4000 RPM as this happened. I think that the "overboost" switch cut fuel on me, but what would couse this to happen? My car is bone-stock and is running like a champ. (25+ MPG highway) I have been driving the car a little hard this morning after the incident trying to duplicate the "fault" but have only been able to grin as the car screams like never before. It's not that I am complaining about the extra performance but I know something is not right, any suggestions?<P>Prospero