I HAVE A CHEVY 350 ROCKER ENGINE WITH CAM ANDD 750 CFM CARB. IT RUNS FINE AT IDLE BUT BACKFIRES THROUGH THE CARB BETWEEN 2500 AND 3500 RPMS. I'VE REPLACED THE WIRES W/ 8.5MM SUPER CONDUCTOR WIRES AND NEW SPARK PLUGES AND THE PROBLEM CONTINUES.

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