how do i fix over-revving, mondeo, 1997 ?

How do you fix ford mondeo 1997, 2.0ltrs petrol glx. We just change the timing belt and fan belt and was also leaking oil seal.After change everthing when you started the car it revs high and shakes. when drive it fine but when you have to stop at light the start shaking. What is the best solution to fix it?