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  1. 5,000 RPM roughness

    Engine Problems/Maintenance
    1996 Impala SS, 41,000 miles Florida car, Hypertech Pro, K&N, shift kit, 160F thermostat. When running out to redline, there is a slight hesitation or roughness at between 5,000 rpm and 5,500 rpm before it automatically shifts. Anyone have any ideas? thank you.