rocker

when i push the clutch pedal to the floor at a junction the revs go up to 2000 to 2050 all the time i was told it could be sucking in air. i changed the brake servo breather pipe which goes to the manifold and that has stopped the hunting problem but the revs are still high all the time??? i have a ford galaxy 2.3 s reg. can any one help me out please??? thanx