1997 mercury villager and keep getting a 4 misfire you've changed the knock sensor plugs wires and distributor cap and rotor still missing could someone help thanks?

If you're experiencing a persistent misfire on your 1997 Mercury Villager after replacing the knock sensor, plugs, wires, and distributor cap/rotor, consider checking the fuel injectors for clogs or malfunction, as well as the ignition coil, which could also be causing the issue. Additionally, examine the engine's vacuum lines for leaks and ensure the timing is set correctly. You might also want to conduct a compression test to rule out any internal engine issues. If the problem persists, using an OBD-II scanner to check for error codes might provide further insight into the misfire's cause.