xantia 2.1td problems with revs

hi. i have a problem with the engine revving up and down when idling and revs increasing when changing gear.had it code read but nothing showing.had it into a diesel specialist he fitted factory recon diesel
pump but problem still occurs (also tried changing accelorator sender)has anybody had similar problems .thanks in advance
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temperature sensor (green)
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Did you ever get this sorted, i have just posted a similar fault with my Xantia 2.1 TD
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