Spark plug isn't firing.
If the spark plug isn’t firing, the spark plug gap could possibly be to wide from high mileage. This plug could also be physically damaged or the spark plugs porcelain could be cracked. If the spark plug wires are cut or have excessive electrical resistance the plug will not fire. Also, there is a possibility that the spark plug coil is going bad. It will not create enough power in order to make the spark jump the gap and therefor will not fire. A proper diagnostic should be carried out by a qualified technician and a replacement of your spark plugs replacement can be done if necessary.
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