Engine misfiring can be caused by burned valves or by some internal engine problem. Intermittent misfiring is usually caused by an ignition problem. Check for the following:
fouled or worn spark plugs
improperly gapped spark plugs
Damaged insulation on secondary wires, or disconnected wires
Cracked distributor cap
Carbon tracks in rotor
worn didtributor shaft
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Saturday, December 23rd, 2006 AT 8:17 PM