Yes, if the wire is old and frayed or if it is rubbing against metal the wire could ground out and discharge into the engine block before it get to the spark plug causing the plug to misfire. If the contacts are worn or loose you could also get an intermittent misfire.
P0304 is a cylinder #4 misfire. Check plug, wire, coil, etc.P0304 is a cylinder #4 misfire. Check plug, wire, coil, etc.
A fouled spark plug, high tension wire breaking down, a bad distributor cap/rotor, coolant leaking into the combustion chamber, etc.
On my ( 1991 ) Ford Mustang 5.0 liter the spark plug gap was ( .054 inch ) What year of Ford Mustang ?
In general (very loosely) a misfire can be a bad plug, wire or coil.
A cylinder misfire can be cause by a bad spark plug or a bad fuel injector. Replace the spark plug to see if the problem is corrected.
where is fill plug located on 1994 mustang gt, rear diff
more than one spark plug is misfiring
Buy a new car.
Were the spark plug wires replaced? Even a pinhole in a plug wire can leak enough spark to cause a misfire. Try swapping that wire with another similar length wire from another plug and see where the misfire is then. If the misfire moves to the new cylinder or ceases completely, you'll know the wire was bad.
A cylinder misfire could be from a bad spark plug, bad spark plug wire, or a bad coil. It could also be caused by a plugged or faulty fuel injector.
diagnostic plug for 1993 mustang lx where is it