Hey all. Well i had a missfire before whenever i came on boost, so i got a brand new oem dizzy cap and rotor arm and also some new leads. That fixed the problem perfectly, was well happy. Anyway, boosting along the other day on the motorway and thought id go for a nice run in 3rd, see'ing as i have a gt box i'd see how long the gear is as i hadn't done it for a while. So there i go in 3rd gear full boost, hits AROUND 6k revs and starts to missfire?????? What can be the problem? I run idium plugs, i have cleaned them up proper, polished them up and took a fine bit of sand paper on the electrodes but still no luck. Everything else is brand new i.e, rotor arm, dizzy cap and leads! HELP!