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    5.7 GI-C backfires under load above 3200RPM

    Forum My 2003 Larson twin 5.7GI-C port engine backfires under loads above 3200rpm. This a very recent problem. The engine seems to idles fine. Its only under full throttle loads that the engine backfires. I have new rotor, cap, plugs and recently serviced/cleaned injectors. Starboard engine...
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