my Skoda Octavia NFL (2020-Present) misfires and runs rough what could be the cause

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plugs

• Remove the engine cover if necessary.
• Use a socket set to remove spark plug wires/coil packs.
• Extract the spark plugs using a spark plug socket.
• Inspect the spark plugs for wear; replace with OEM or recommended plugs if necessary.
• Reinstall spark plugs and tighten to manufacturer specifications (typically around 13-15 ft-lbs).

3. Check and Replace Ignition Coils

• Remove the ignition coils using a socket set.
• Inspect coils for cracks or signs of wear.
• Replace any faulty ignition coils with OEM parts.
• Reinstall the coils securely.

4. Clean or Replace Fuel Injectors

• If injectors are clogged, remove them from the engine.
• Use an ultrasonic cleaner or injector cleaning kit to clean them.
• If cleaning is ineffective, replace with new injectors.
• Reinstall injectors ensuring proper seating and connections.

5. Inspect and Repair Vacuum Leaks

• Visually inspect vacuum lines and intake manifold for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to detect leaks.
• Replace or repair any damaged lines or gaskets.

6. Verify Fuel Pressure

• Attach a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "on" position without starting the engine and check the pressure; it should match manufacturer specifications (usually around 50-60 psi).
• If pressure is low, inspect the fuel pump and replace if necessary.