I was pulling into a parking spot to turn the bike around and back into the spot. While sitting sideways in a parking spot, I increased the throttle slightly to pull forward. The throttle acted as if it was stuck and the bike lurched forward after I released the throttle. I applied the front brake but the bike continued moving forward pushing the front tire which left a skid mark on the pavement. I continued forward until the bike ran into the driver's door of a parked car. This was the second time the throttle stuck in this manner. The first time I was leaving my driveway when the bike acted in the same manner and caused me to run over some Christmas lights on the edge of my driveway. The first time I did not realize what happened therefore I did not file a complaint. I researched this on a motorcycle forum and found many instances of other GL 1800 owners experiencing the same problem.