on the motorcroft 071 , i put these in my 4x4 stage one switched boost , to replace old agpr12pp hoping it would help my misfire on boost , set at .6mm after 60 miles of perfect boosting on both settings , next day when i come to it i thought it was running on three n smelt of fuel like over fuelling , i've since had the plugs out n widened the gap n the misfire on boost has come back but running fine not over fuelling . driving me mad cos i thought i'd cured my problem now back to square one if any one knows the exact gap needed coz i think this is my problem .
regars gary