Front Suspension problems of the 1998 Chevrolet Cavalier

When the brakes were applied engine raced and the front end started to vibrate. The dealer has been contacted.

I received my 1998 Cavalier as a graduation gift-,expecting reliability. I have had nothing more than problems. The car has been taken to the dealer nine or more times for the problem I am reporting. Each time I have taken it in I have been told that there is nothing wrong. I have removed both front wheels to find that there is one half inch of play in the rotors, causing the wheels to shift while driving down the road. Also, causing uneven wear on two new (front) tires. I am nine months pregnant and terrified to drive my own car for fear that the wheels are going to fall off!!!!! can something be done about this?.

Vehicle will jerk forward when vehicle is in park position, and started engine. Dealer has done an alignment/replaced steering box. Defect is still occurring. Dealer cannot determine defect.