I just bought Pre-owned Lexus RX 300. I bought it with 50,000 milege on the car. I bougt the car 2 weeks ago and I am coming across few problems. When I drive the car, it drives fine but when I stop at Stop sign or Red light or something, and when I give gas to go, it doesn't want to go for a second or 2 and than it just gives hard push like some one just hit me from the back? I don't know why it does that? I put gas in the car twice already with no problem and last night when I put gas, now the gas indicator doesn't wanna go up (it's stuck)? Can someone help me and tell me what needs to be done? I am going to the Lexus dealer on Monday to check it out. If I get some answer before that, that would be great. Thanks. Hetal