David,
I too have had this intermittent phenomenon for years and the idle air control valve repair kit didn't make any difference. I've checked the throttle cable adjustment and the crankcase breather tubes are fine. Unfortunately the cause eludes me at the moment. I have identified a poor electrical connection on my power VIS actuator plug which is on the list of things to do when time allows.
If you find out what it is please post the answer!
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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