Car looses a cylinder

I recently replaced my plug leads in my 2000 ford falcon because #6 lead was broken at the spark plug.the car idles beautifully or when driving normally,but under heavier loads(passing,freeway speeds) the engine intermittently looses a cylinder and changes down a gear when cruise control is on.Sometimes the problem last a few seconds,other times the problem lasts the whole trip.I didn't have the problem until I cleaned the engine down to replace the radiator and replace the lead.Would it be the coil pack,plus I haven't replaced the spark plugs.

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