For between 2-4 months now when my car is cold I have to push down on the gas in order to get the car to move and after a couple seconds it will jerk back or forward whichever way I am going. If I let the car warm up for about 10-15 minutes it doesnt do it. Then today when I went out to leave for school the car wouldnt back up like normal so I held down the gas and it jerked back for a second and then wouldnt back up or move forward at all even after I let it heat up more. I tried all the gears and none of them would let the car move at all. My mom thinks it might have something to do with the transmission but I dont know anything about cars so I have no idea. I have no idea what could be wrong or what to do.