Random misfires on random cylinders!
Does weather, or water play a factor?
Does the random misfires only happen to bank1 or bank2?
*What's common to random misfires on 2-cylinders? If a bad coil pack, see
www.rockauto.com
Is there any other Diagnostic Trouble Codes?
What size engine?
1 of the 4-strokes is missing on all cylinders, the question is what's common to all cylinders?
Air - new air filter, clean MAF sensor.
Metering air leak on the PCV, EGR, or air intake system.
Fuel - Fuel pressure test, fuel filter
Exhaust - Back pressure test down on catalytic converters.
Ignition - Coil, Cam, ICM, or crank sensors.