Thanks for your reply EF_Falcon_Guy.
It takes about 3 seconds to return to idle.
If I start the car with the aircon off, it starts straight away, no problems.
If I start with the aircon on, it starts immediately, but the idle does a bit of mucking around, (revs out to about 1500, then down to 600, then back up to 1000, then down to 600, then up to 700, where it will sit comfortably for a while).
The above only happens when the engine is warm, (I.E. driven recently), but everything starts and runs fine when it is cold ???
Its starting to get on my nerves as well, as when the transmission is in drive, and I am slowing down to a stop, the thing accellerates, when it shifts into first.
Also, driving around shopping centres, dropping the speed below about 10Km, makes the thing accellerate.
When this happens, I either lock the transmission in first, to stop this, or drive at about 15km (A bit too fast for shopping centres though).
When the engine is warm, I can make it do this at least 95% of the time ????