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hi got a few problems with my turbo uk model ej20 block, when putting full throttle its pulling back like im pressing brake in juddering bad but if i only put half rev on til i get past 5k revs then floor it its straght there any ideas? been told it could be boost control thats gone down but unsure
its got a megnex exhaust and a dump valve thats all its ad done, its ok in first 2 gears then its buggers up, i ad sum shell super and it ran ok just holding back abit but not half as bad could it be down to fuel? can you ad high octane additive juddering i used jet super unleaded then it went juddering when getting past 3k revs but