I have continued to have problems with this although cleaning out the IACV has helped I am still getting "over-revving". I got onto NECO and have discovered this is a common problem and discovered you can have the same issue with the throttle body caused by carbon build up on the butterfly valve. So that will be the next thing to be done.
I am also getting the check engine light (the orange one on the dash) and this is triggered by a low coolant level in the coolant resevoir. Checked all this and have narrowed it down to a faulty sensor which apparently is also very common on Cougars.
They are U$100.00 to buy on line so I will have to try and fix it myself.
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