hi my 2003 hdi 70000miles always servecd,its running ok no probs elswhere but has just started "hunting" whilst ideiling,i have no warning lights on and have had it plugged into a peugoet fault finder and no fault codes are found,it has had all fuel system renewed just after i bought it back in 2004 because of fuel pump breaking up inside.can anybody shed some light please. "hunting" i would desrcibe as running unevenly on tickover,thanks for any help