What is causing my car to jolt foward a little bit, even though I am stopped?

It could be several things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. Is the idle speed too high? Perhaps there is grease or contamination on the brake rotors, to hard to say without being able to drive the car. Possible a bad engine mount.

It is possible your idle is set to high to over come a poor running engine. One other item could be an issue with the transmission if it is an automatic. Both of these conditions will require a daig. for proper repair to be done. We will be glad to help you. McNeil's Auto Care