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If you wash your motor with water, then water could've seeped in there.
If you mean that the wire came out of the boot, then pull the boot off of the spark plug and use a spark plug socket to remove the spark plug.
Spark plug wire not connected to spark plug? Spark plug wire connected to Wrong spark plug? Vacuum line disconnected? Bad spark plug or wire?
There mgith be no spark because there are different reasons.one is there is rust on the flywheel. Second is that the coil is to far away.
Probably losing spark in that one cylinder, maybe a faulty spark plug, a spark plug wire or distributor cap.
Start by checking your spark if you don't have spark check the spark plug. If the spark plug is ok then check your flywheel - It may have rust on it. Clean it up and clean up your coil and see if you have spark. If you still don't have spark change your coil. If it has spark and no fuel - clean your carb.
spark module is bad
If you mean on the exterior of the spark plug then the valve cover gasket is leaking. If it is on the electrode of the plug you are burning oil.
You just have to grab with a pliers and pull it out. You will have to twist and wiggle to break the rust though.
Assuming you mean spark plug gap, it varies with type of plug used. Need more info on spark plug used.
It is a good sign that you may have a chipped, or malfunctioning spark plug or spark plug wires
I'm guessing you mean spark plug gap? .050