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
Bad coil, a new one fixed my 2004 2.0
P0302 is cylinder number two misfire detected.
It's possible your drive belt is loose and skipped a couple "cogs."
How do u fix a misfire
You need to dry out the ignition circuit to no 3.
That would be an engine cylinder misfire , but either more than one or it can't determine which engine cylinder is misfiring
most 2000 model year focus have a fuel delivery module recall.
In general (very loosely) a misfire can be a bad plug, wire or coil.
There are a couple of reasons why a 1999 Ford Contour may misfire. The spark plugs may need changed or the coil pack may be bad.
engine misfire
2001 ford f 150 misfire on acceleration
2005 ford escape computer misfire#5 i was told there was a recall