thanks for the help mark, trying t get t the back of a nasty misfire on full boost, car runs ok when off boost but give it the boot n she misfires violently, on the odd time it doesnt miss it feels very down on power, unless the cars been parked up for a while then its a bit better, got a new set of leads coming along with the sensor so ill see how it goes, anything else u could think off that could cause the prob i hav?