hiya mark good of you to reply m8. Ive only had the car fr a month, this is my first lexus.the car has done 140k, the chap that owned it before me really looked after it for the 5 years of his ownership.i have the old sparks they look fine tbh, doesnt seem to be the plugs that were doing it, because i put injection cleaner in it after the new ones were fitted and we drove back from bolton with no problems at all, the car seemed to clear itself when the fluid had started working.I"m not very up on engines ect really.but getting worried now lol.