2001 f150 4.5 New problem cyclinder # 5

Thanks for all of your help with the location of # 5, I was a Chevy man in my younger days so I was on the wrong side and location for # 5. Now I changed the pack on the cylinder in question, But now it is still hit and
miss ( no pun intended). Some times it will run fine then all of a sudden it miss-fires again. My little scanner is telling me "IGNITION COIL C PRIMARY/SECONDARY CIRCUIT MALFUNCTION" What the hell does that mean and how do I fix it ?
Thanks P.S. what ever happened to the days when you could do all of this without a computer and scanner ?
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I'll never forget those days with points, condenser, carburetor & a single V belt driving nothing else but an alternator & water pump (with fan attached).
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Replace the coil pack, boot and plug.
Ed
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