'95 skyline gts rpm prob

The car is completely standard and has covered 50k miles with no probs but recently the idle has occasionally been erratic - sometimes climbing as high as 4,000 rpm when it should be at idle (very embarassing at traffic lights!) not to mention making the car difficult to drive and somewhat unsafe. Thankfully this car isn't my daily runabout. There doesn't seem to be any rhyme or reason to the problem, it can be fine for days or even weeks then suddenly play up constantly and then behave gain just as quickly.

Any ideas?

TIA

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Kevin Scott
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John Smith

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