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Missfire in cylinder 4 Ford focus 1.6 Zetec?

I have a missfirew in cylinder 4 , i found this out by having it pluged into a computer , i have changed the plugs , what next??
Scott Ramage, August 2008
leads then coil pack go try a set of leads first.

john howatson, September 2008
assuming you have checked the cylinder compressions are all the same,then i'd guess a faulty ignition lead or coil pack

caine, August 2008
link Click here to see other fixes for Ford Focus.