What's going on and how can I fix this? My car jerks in idle when I apply the brake (not emergency brake) Almost like its about to kill over. When its on and in park it doesn't do it as much (but still a little bit). The rpm needle jumps between 0 and 1 when it does this irregular jerking and a little bit between 1 and 2 (closer to two). It also jerks a little when I am passing 40 mph. Its a 1995 Saturn LS 4 door 4 cyl sedan. Oil and all fluids have been filled and checked. It does it whether my car is full of gas or not. It just passed saftey and emissions too. Any help is appreciated.