Misfire at no. 3 -check compression and injector for that cyl.
Random misfire P0300 normally points to false air and bad fuel
Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
Also check the PCV system
Monday, March 2nd, 2009 AT 4:30 PM