Citroenxara Fair

Hello everyone, I request your help I have an Altima 2005 and turn on an icon of evil engine, they already scanned it and left with the singles possible Falls, 1.- cables or vujias, 2.-Bobbin damaged in cylinder four, 3.- Vacuum leak in cylinder four and possible damaged injector. The vahiculo is prescribed and works well but since at 7 kilometers traveled he turns on the icon of bad funeral, the vehicle is changed the cylinder coil three to four, and follows the same failure in cylinder four, the vehicle when it begins with the fault is heard as a pet. Thanks in advance for your help.

OLA: How much do you change the spark plug? And the spark plugs, did you take them out to see how they are?