I have just purchased a 1999 Lexus LS with 49K on the odometer. Had a safety check from the selling dealer AND had it looked at by the local Lexus dealer before purchasing it. I parked at my residence with the car's nose pointed uphill on a modest incline. On going to use the vehicle, I started the car with my foot on the brake and then shifted into drive. I took my foot off the brake. The car, in D, proceeded to roll backwards down the incline and almost into my garage doors! Only by applying the the brakes and then quickly moving to the gas peddle was I able to get it up the incline. Advice on the problem before I go to the Lexus dealer. Thanks.