Random misfire are usually caused by ignition faults and most often it is either bad spark plugs, wires or rotor.
Get the plug wires ohmed out for resistance. There should be continuity and less than 25 k ohms. Check the connectors for snugness when plugging into soark plugs.
Check the ignition timing, with the octane used, the timing should not exceed the specified mark as indicated on the crank pulley.
Saturday, October 3rd, 2009 AT 9:24 PM