This could be caused by bad wiring but is usually caused by a weak coil. Change the plugs and install a new coil....I'd recommend doing all of them. This should take care of the misfire.
In general (very loosely) a misfire can be a bad plug, wire or coil.
If check engine light is on, have a parts store read the code. It will tell you there is a random misfire and usually what cylinder is misfiring. Replace the coil pack for that cylinder and all will be well.
Spark plugs or Coil pack most likely
coil or icu
normally the coil pack
P0304 is a cylinder #4 misfire. Check plug, wire, coil, etc.P0304 is a cylinder #4 misfire. Check plug, wire, coil, etc.
fastest way scan engine for codes locate cylinder by code usually a bad coil. wire or plug is shot
Ignition coil misfire cyl 7
The Ignition Coil is the one that cause misfire or Spark Plugs
start with checking the coil packs wires sparkplugs
It means the coil or the spark plug is dead.