Possible Cause

DTC P0300 set with P0301, P0302, P0303 or P0304 indicates random misfire. To determine cause of misfire, check the following:

• Fuel pump insufficient fuel pressure/volume.
• Fuel pressure regulator stuck open.
• Fuel return line clogging.
• Fuel filter clogging.
• Distributor malfunction.
• Ignition coil wire open, or leaking.
• Ignition control module malfunction.
• Low compression.
• Poor fuel quality.
• VTEC system malfunction.
• H02S malfunction.
• H02S circuit malfunction.
• Carbon deposits on valves.