Have you checked the timing? 6 degr btdc is standard although with a mild cam could be a little more (back it off when it starts to ping) also check that the throttle is opening fully when the acelirator is flat to the floor. It looks like you already have a new air cleaner, these were all problems with my RS when I got it, all cheap to fix & made a hugh difference (maybe not to fuel through cause its heaps more fun to drive now so you sort of use more lol)
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