I had same problem, at start the car ran rough and engine code said misfire on one cylinder. Happened at start up and went away after a few minutes till finally one day engine blew.
Turned out it was a valve seat which was displaced. Fairly common problem amongst escorts. Get head taken off and have this reseated asap before valve seat breaks and goes thru the engine
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Thursday, January 10th, 2013 AT 12:50 PM