i came out this morning and noticed a puddle of transmission fluid on the groung under my car..so i instantly cranked up my engine and added transmission fluid in it,but once i added it,it came straight back out of the car onto the ground.so i got in the car and tryed to drive off but once i steped on the accelerator the car jerked and moved slowly,but not moving fast enough to keep up with traffic.i want to know do i need a new transmission?