Steve,
my experience is that the Zetec is sensitive to even the slightest defects in the ignition system due to the very lean mixture settings. My (silver top) Zetec misfired when I gave it to much throttle. I changed leads and plugs and have had no problems since...
-99 4/4, 1.8 Zetec, Indigo Blue, 2-seat, Suplex RS
-04 Citroen Pluriel, 1.6 Sensodrive, Met Orange
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