Bad coil, a new one fixed my 2004 2.0
P0302 is cylinder number two misfire detected.
There are several things that can cause your 2003 or Expedition to misfire. The most common cause is a plugged catalytic converter.
It's possible your drive belt is loose and skipped a couple "cogs."
How do u fix a misfire
If you have a "check engine" light on, start with having the codes read. A misfire code can tell you which cylinder or cylinders are having problems. A misfire could be the cause of your engine vibration.
No it will not cause misfire.
Contaminated fuel could cause 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
Bad plugs, wire , coil packs if it has them.
Code P0304 on 2000 Ford Ranger is: Misfire at cylinder 4 detected. May be cause by a bad spark plug.
most 2000 model year focus have a fuel delivery module recall.