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Your vehicle doesn't have spark plug wires . Has coil on plug ignition system . Eight individual coils sitting right on top of the spark plugs . An the spark plugs have the tendency to break in the cylinder head . Does your ford have the 5.4 L 3 valve engine . Your best bet is to take your vehicle to a qualified repair shop that has the tool to take the broken spark plug out off the cylinder head. Ford 4 6L 5 4L 3V Spark Plug Removal Watch this ford tech .
check that the egr valve is not stuck open remove it and cover the hole on the intake side and see if it goes away or with engine running remove the vac line from the valve and install a short length of hose and suck on the hose to draw a vac on the valve it only takes 3-5 inches of vac to open it the engine should stall or run even worse if it is not stuck and if it was stuck open you didnt change anything
IF YOU HAVE THE EI IGNITION SYSTEM.YOUR SPARK PLUGS IS UNDER EACH INDIVIDUAL COIL.DISCONNECT COIL ELECTRICAL CONNECTOR.THEN REMOVE COIL RETAINING BOLT.THEN REMOVE OFF SPARK PLUG.THEN REPLACE SPARK PLUG.YOU HAVE 8 COILS TO REMOVE BEFORE REPLACING SPARK PLUGS.
to replace spark plugs remove spark plug wire boots. use special sparkplug socket or else you can break the sparkplug. to remove turn ratchet counterclockwise remove all four one at a time, make sure that the sparkplug gap is correct. most plugs come pregapped...read the box it will tell.you. do not overtigheten plug once it has fully seated give it a good snug....if you do one at a time you dont need to mark the spark plug wires. if you mix up the wires your car will back fire which could cause severe internal damage.
What is a Taurus 2 cycle??? When does it misfire? Report fully!
Quick and simple solution is change the spark plugs, use the plain platinum type, and the spark plug wires. When installing the plugs, be sure to use antiseize compoud on the plug threads before installing them. The proper spark plug gap will be listed on a sticker label under the hood. It helps to remove them air filter assembly and duct work to get easier access to the back three plugs.