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Hi there I've currently have Error 21 (ignition signal circuit). I've also have a misfire happening only at low RPM. It will stall out if you accelerate approx 50%, if you go 75% it will drop the revs and almost stall then shoot up, but accelerate slowly it will go just as normal (these are all from stand still and rolling slowly) Firstly the car is R34 GT-T manual running stock ecu Injectors Turbo Throttle body with TCS still Aftermarket Greddy intake Front Mount intercooler Splitfire Coilpacks I've installed the splitfire coilpacks last week (brand new) along with spark plugs gapped at 0.8. I checked the coilpack loom for constant ground + 12v with the ign on and tested trigger signal for continuity from the ecu to the coilpack loom (so those have all passed) I've heard people say replace the loom but idk if thats going to resolve it for me Injectors were cleaned and flow tested about a month ago I've heard CAS could be a problem, I assumed mine was fine and wasn't going to be and issue. But I bought another one and it was still the same issue. Then borrowed someone's with a working one and still same issue Hope someone has some knowledge
