Hi. Advise/help needed please. My tdv6 revs are hunting above idle. When driving or in park if you bring the revs above idle they start hunting about 100rpm either side of what it's being held at. If you switch engine on and off several times in a row it will then be ok until the next time it's restarted. There are no codes. Egrs have now been blanked to see if that was the cause but no difference.