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Just finished reinstalling the head on my R33 last week thanks to a couple of sheared exhaust manifold studs. Chucked a new set of iridiums gapped to 0.8 in for good measure as the Power FC is being installed/tuned next week. Was running sweet again until this morning drove to work and now engine has started to run rough constantly throughout rev range but most noticeable at idle. More of a slight shudder than anything else. Any ideas what this might be? Would it be fuel system/injector or spark/coil related? Anyone had the same problem and if so what was it? Any help would be great thanks

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https://www.sau.com.au/forums/topic/26309-help-engine-misfiringrough/
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