Misfire - Engine Miss
Compression Test Step 12 - If the compression test is okay along with a wet spark plug, the ignition coil needs to be tested.
Test Ignition Coil Output Step 13 - Spark plug wires are designed to transfer an electrical charge from the coil to the spark plug, when these cables wear, they can short circuit causing a misfire.
Shorted Spark Plug Wires
Test Fuel Injector Operation Step 15 - A random misfire is can be associated with broken or dilapidated vacuum hoses or tubes on and around the engine causing a vacuum leak, these hoses are typically connected to the engine intake manifold and supply engine vacuum to various accessories such as the brake system. If an intake gasket fails or a vacuum line that is close to an intake port it will cause a steady misfire.
Repair Vacuum Leak