Could be various things - certainly not right; it should settle down smoothly, not bounce.
Starting with the easy ones, have you cleaned the throttle valve recently? Dirt stopping it opening and closing smoothly can cause these symptoms.
David
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VOC 400 Series Register Keeper
The current fleet:
1997 440 LE, 1996 460 CD,
1994 480 GT and 2007 V50 SE Sport
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