Engine Misfire - All Conditions

Check fuel injectors.
Check ignition and sensor wires for proper connection.
Check ignition and coil circuit.
Check crank and cam sensors (if applicable).
Check for gasoline in oil.
Check crank and cam sensors (if applicable).
Check throttle position sensor and connector.
Check for vacuum leaks.
Check EGR valve operation.
Check engine mechanical condition.
Check MAP sensor.