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    1989 Mustang 5.0, Sputters and Smokes at High RPM

    i had the same problem with the breaking up around 400 rpm,, try using the brass cap and rotor,,, that was my problem... i had swapped the rotor cap from my brass one to the aluminum one because thats what i had sitting around and the brasss one was bad,,,, took it out for a drive and it would...