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  1. C4 Corvette
    My 92 is showing me diagnostic codes #27 and #36. #27 is a quad-driver module #2 circuit - but I can't find any explanation as to what circuits/actuators/etc it controls. #36: Opti-Spark Ignition Timing System. (High Resolution Pulse.) My ECM was rebuilt about 5 years ago and recently my 92...
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