i've used optimax and all that crap... doesn't really do a great deal... a few people were telling me it was the injectors, and to run some injector cleaner...
i replaced my fuel filter, the old one "(once we had it off) was putting out almost black looking petrol *yuk*
but now its drastically out of tune, WTF? i only had it tuned yesterday.,... the idle is really fucked...