Fiesta (endura-e) over revving

Make: Ford
model: Fiesta MK4
year: 1998
mileage: 80 000
engine: 1300 cc, endura-e (same as in KA)

I have a problem with the engine overrevving when pressing the clutch, it appears rarely but it seems that it gets worse when driving for a long time.

It seems that it's a very common problem with that engine but after lot of googleing I didn't find a clear solution. Here I what I found as the possible causes:

1. Throttle position sensor.(T.P.S.)
2. Engine coolant sensor.(E.C.T.)
3. Idle air control.(I.A.C.)
4. Some models-maf, or map sensors.
5.E.C.U.
6. Clutch switch

But it must be only one of theese.


Thanks.