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If this is a V12, it's because the basic idle speed is too fast and the ECU shuts down the engine until it drops - and then the cycle repeats. This is usually because the idle speed controller is stuck open. You can try adjusting the idle speed on the 13mm screw on the side of the idle speed controller (back end of left hand bank on the water rail), but this won't fix a stuck ISC. You need to replace it (about £150) or attempt to repair it if you're really brave!
Anther possibility is an air leak in the inlet manifolds, downwind of the throttle - has much the same effect. You might hear a load hissing.
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