Why does my Peugeot 406 lose power occasionally?

I have a V-reg Peugeot 406 HDI 110bhp with 176,000 on the clock which is well maintained. At random times it loses engine power when running and the speedo drops to '0'. After a mile or so there is a surge of power and the speedo goes back to normal, and the cars runs as normal. Ideas?

Asked on 17 July 2010 by andyrt

Answered by Honest John
Electronic throttle problem; maybe a sensor; maybe an earth to a sensor.
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