Keith,
In addition to the test procedure outlined in Bentley, you can remove your Idle Stabilizer Valve and clean it with carb cleaner or brake cleaner.
Every couple of years, I remove the ISV from my '84 Carrera and spray carb cleaner inside the ISV. Shake the stuff around in there and pour out the excess cleaner; any remaining cleaner will evaporate quickly. I do this because the ISV gets gummed up over time.
If testing and cleaning the ISV doesn't fix your problem, let us know and we will move on to Plan "B".
Bruce
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