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Misfire when cold

gocartownergocartowner Posts: 1
edited May 2016 in Ford
My daughter's 2003 Focus wagon, 2.0 Zetec engine misfires when cold or not driven in a few hours. It bucks violently but never stalls. After about 3 minutes, it clears up and runs great. It only has 35k on it, we replaced the plugs, wires, fuel filter and coil. Seems like it could be a warm-up sensor, I'm not sure what to try next. Any help would be appreciated...
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