Thanx for the replys guys i cleaned the breather pipes induction and cold air flow pipes and the butterfly on the throttle body, but really strange this one if you strat the car and put your foot on the throttle and leave it on for 30 secs just above 1000 rpm the just ease off it runs and idles fine (strange) but if you start it and rev it hard and let the revs drop really quick it wont idle or will idle up and down and cut out at junctions
so could resetting the ecu work?

i bought the car two days ago and the previous owner has fitted a fse power boost valve induction kit and exhaust so maby this is part of the problem???? any other advice would be greatful thanx lee