sorry guys,did not tell full story,also had a misfire which was down to number 4 injector,which i replaced earlier,when car was back in i carried out all the usual tests again,still a little unsure of what was really happening,so did a extened oil flush,new oil/filter and a hydrallic lifter addative,also remove 3 old injectors and put them in ultrasonic bath.vehicle now much better,even if i worked for nothing the possible other parts required would out way cars worth.thanks for listerning....fix ??????? customers happy with car,thank god...