yeah cheers for that in karls dafence he said it wouldn,t idle properley below 3.87% he reckoned engine was getting a bit tired and not getting complete combustion on idle,on greens though was no problem. a complete ignition check was carried out and found to be fine, no missfiring on boost drives and pulls loveley and idles well.. at that idle setting anyway. time to save for rebuild now.yeah tab was waiting for fans to cut in first.