Its running on a stage 2 chip and on greens. I know my fuel mixture is rich and i was just thinking it could be this. Why would spark plugs cause it to idle poo. Ive got ngk irdium plugs. So how could it be the iscv surely thats doing its job isnt it. Ive still got the same problem which i would like 2 cure and the fault is that when im driving along when the engine is cold and it feels like the choke is on cause i can take my foot off the throttle and the car will still keep going. If i dip the clutch the revs rise then drop for a bit then it idles.i love my cossie but i wish i cud fix this myself without getting it looked at. Thanks for your help and keep replying please.