Yes. that plug will need replaced.
bad spark plug wires, low battery, broken rotor in the distributor
Could be bad spark plug, spark plug coil, mismatched spark plug wire, or loose/broken motor mounts, or problem with head gasket.
bad plug bad plug cap stator
If the car will not start...the spark-plug is bad.
A bad fuel injector, a bad spark plug, a bad spark plug wire, a bad distributor cap or it could be a mechanical problem such as a burned valve, bent pushrod, broken rocker arm or a large vacuum leak.
Bad spark plug, bad spark plug wire
Yes. If the ignition is malfunctioning, the spark plug will not ignite. A bad ignition module, a bad spark plug or a bad plug wire are the most common causes of that (besides a bad battery, of course).
bad spark plug wire.
Spark plug wire not connected to spark plug? Spark plug wire connected to Wrong spark plug? Vacuum line disconnected? Bad spark plug or wire?
poor spark plug gap bad wires or weak coil or bad spark plugs
If you know that there is spark at the distributor cap then I would think it would be bad spark plug leads.
Could be a bad spark plug, a bad spark plug wire or a bad fuel injector.