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move the ignition coil to another cylinder and see if the miss fire moves. If so replace that ignition coil. If the miss fire stays on that cylinder it is more likely the fuel injector. Was their carbon on the spark plugs when you removed them? This is indicative that the fuel injector is gummed up.
Move the ignition coil to another cylinder and see if the problem moves. If it does it is the ignition coil replace it otherwise it is probably the fuel injector.
NEED A SCANNER AND WATCH THE MISSFIRE GRAPH, SHOULD SHOW YOU WHICH CYLINDERS ARE MISSFIRING. ALSO DO A COMPRESSION CHECK.IF ONE OR MORE OF THE CYLINDERS IS WEEK WILL CAUSE THIS ISSUE. MANY THINGS CAN CAUSE THIS SUCH AS POOR FUEL QUALITY, SPARK PLUGS AND OR ONE OR MORE OF THE COILS COULD BE BAD.
It can if the misfire is bad enough. 300 tells you that you have a random misfire, 305 tells you misfire on cylinder 5, and 306 misfire on cylinder 6. Correct these and your vehicle should improve, however I would check the codes once again after this issue is corrected to determine if another DTC code was missed.
Do you mean "missfire on cylinder 1", code P0301? If so, that means that the computer has detected incomplete combustion in the #1 cylinder, which would be the front passenger side cylinder. There are many potential causes to a cylinder missfire ranging from worn / bad ignition components, clogged / bad fuel injector or even internal engine damage.
However the most common cause, especially on ford vehicles is a bad ignition coil. When trying to determine the cause of a missfire on an engine such as the one in your Navigator i start with removing the plug and checking for carbon tracing, excessive plug gap or contaminants on the plug. If that checks out ok i then swap the ignition coil from the missfiring cylinder to one that isn't. For example, I would swap the ignition coil from #1 to #2 and clear the codes. Then drive around until the light comes back. If it comes back with a missfire on cylinder #2 then you know the cause is the ignition coil and it has to be replaced. If it doesn't then it is something else causing the missfire which will require a bit more diagnostics.
How many miles are on your Navigator? Have the plugs ever been replaced? If you have close to 100k it would be a good idea to replace all of the plugs. Be careful when removing the plugs, it's not difficult to pull the threads right out of the head when removing the plug.
you may try your rotor button and distributor cap. and spark plug wires. try your map sensor also they tend to cause a lot of misfiring if they go bad.hope this helps.
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