I have a 2004 1.8 Zetec petrol Mondeo Mark 3, and was suffering from a stuttering under acceleration from low revs. What I found which luckily was before I went down the change major components was a simple pipe which is in the front of the inlet manifold leading to the EGR valve which Ford in their infinite wisdom have hidden behind the inlet manifold. Pipe had a split just out of eyesight. Luckily it was long enough to cut at split and still reach to re-join.