The normal causes for a misfire would be
Faulty: spark plug, spark plug wire, ignition coil, ignition module, fuel injector are the most common. Coolant leaking into a cylinder is another.
Internal engine problems such as burnt valve, broken valve spring, bent push rod, worn rings
What causes misfire 302, 304 and 306
Yes
Misfire detection.
the gun powder ispacked to tightly and the preassure builds up and can cause it to misfire
In general (very loosely) a misfire can be a bad plug, wire or coil.
Check the wiring to the coil. Make sure it's not broken somewhere. Also make sure the terminals in the plug itself are ok. An injector may cause that misfire also. Too bad it can't be one of the easier cylinders. Those #4 and #8 are a pain.
Time to replace seals, this usually causes misfire.
A misfire will cause flames to come out of the carburettor
Normally a vacuum leak.
Bad distributor cap, wires, plugs, injectors, low compression, broken valve spring, vacuum leak. Realey need to know the year, to help you better.
Dirty connection
Lean Misfire