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    sc400 won't rev past 4000 rpm

    I have a 92 Sc400 that will not exceed 4000rpms in any gear and neutral. I have changed the ECU, checked fuel, changed one ignition coil, changed AFM, and o2 sensors. I have searched and found some with similar problems, but none with solutions. I also checked the EC1 plug and thats good. If...


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