Ford Mondeo V6 ST24 W reg. Revving on its own when clutch down when braking and changing gear.?

When you turn the engine on its fine, after a few miles when its warm and you brake for a junction the revs start going up steadily on their own. Plus when you change gear, up/down its starts again no matter what speed or gear you are in. Basically when ever you de-press the clutch i starts revving up to about 3000rpm.
Ford Mondeo V6 ST24 W reg. Revving on its own when clutch down when braking and changing gear.?
have seen this problem before. as timbo rightly says, check for leaks on pipewprk first. next, check throttle body for wear, as, believe it or not, they do wear out. also, oddly, check oil levels, as too much oil can and does cause 'hydraulicing', or simplisticly, over revving,as the pistons 'bounce'off the excess oil in the sump, caused by the end bearings being clogged with sticky goo in the sump as the pressure caused by overfilling breaks down the oil molecules reducing viscocity.also check that the a.m.s. or air mass sensor is not faulty. as this also causes over revving at times.lastly, get the ecu checked out .
Ford Mondeo V6 ST24 W reg. Revving on its own when clutch down when braking and changing gear.?
Check the air intake pipework for leakage between the filter box and the throttle body.