Sure can - absolutely yes.
See "Related Questions" below for more about these fundamentals of getting the electrical voltage down to the plug to fire off the air/fuel mix.
Internal engine damage.
Yes, absolutely!See "Related Questions" below for much more about changing Windstar plugs and wires
Worn spark plugs would cause mis-firing or non firing cylinders, both are no good for the engine, replacing the plugs may stop the knock (Could also be a different problem) But you should replace spark plugs as soon as possible.
Coil, module, injectors double check firing order on wires
show diagram for firing order for a 1996 ford windstar 3.8 engine
Changing the plugs and plug wires correctly has nothing to do with nor can it cause an oil leak.
coil, distributor, distributor cap, plugs, or wires.
Wiring and internal engine problems can cause misfires.
6 spark plugs
No, not unless your connect the plug wires wrong or one of the new spark plugs was bad.
Propably needs a tune up. Plugs & wires. This vehicle is 11 years old.
yes definitely.