Engine over revving when I put foot down.

[Tractorlad]

I have a focus 1.6 TDCI 2011, for some time when driving , when I put my foot down a little the engine over revvs. Almost like a worn clutch however it is not the clutch. I have replaced the hose from the air filter to the turbo as the old one was split, it stopped doing it for a very short time but soon came back. My local mechanic looked at it but said he could find no reason for this, it had shown no problem on his electronic plug in and he agreed it was not a clutch issue. Anyone got any ideas, it passed its MOT no problem a few days ago.

[pragmatix]

I take it you mean it over responds to the throttle when not in gear, if it's doing it in gear and driving then it has to be the clutch

[Tractorlad]

No its not the clutch, its been replaced with no difference.

[Tractorlad]

I have just had the clutch replaced and a new flywheel. To my dismay the engine still over revs. If I put my foot down you can heard it hunting and the rev counter flicks all over the place until it settles where it should. Could this be as sensor.