Jameslx

Combo (58) 1.7 D Can anyone point me in the right direction.... I have idle issues.. I have been aware of this for a few year now, where the idle will hunt ever so much (700 - 800 Rev) this is from cold. I on super cold morning it up at 1000 Revs, however soon settles back down, but this still ever so hunting. I found that when the vehicle has had a good run when coming off the escalator the vehicle stools, On restarting the engine the rev hunt / bounce from 500 - 1200 and it doesn't settle and stools again. Giving the engine some escalation don't help, the hunt just bounces higher. Dealership told me to check / change the fuel fitter which I did 18 months ago and it helped. So about a month ago I did it again but this fault is back again. I feel this stooling / large hunting is more likely to be happening when the engine is hot.... Any thoughts what could be causing this?? Taking you all in advance. James