....now at 6k revs on any boost i hit like a rev limiter...it goes bang bang...now the limter hard cut is set to 8200rpm so i cant be that...unless my rev counter is out?...Only thing i have tried is closing the spark plug gap to 0.5mm...and no difference...everything else is new...i think it only does it after its got fully fully warmed..not sure though cant remember What van it be?...i must admit i am using old std ford leads and i mean old...trying a set of 909 leads tommorrow...could a plug be down...they are new?