my car has been idling all over te place recently.
the revs would drop when it became warm to around 500rpm.
i adjusted the idle speed screw so that they were just below 1000 (when warm)
when i started the car from cold it idled at 1,200 revs and fell to just under 1,000 when warm then after a little while after this they fell to 500rpm again and stalled at a roundabout (again).
some people have said to check for leaks on the inlet vacuum hoses but there are no obvious splits or anything and i don't know of a way to check them more specifically.
i have also heard that the idle speed control valve (auxillery air device....) is a common weak spot so i thought i would get a new one and see if the problem is solved.
sorry for the 'essay post'! lol