Spark Plug Wiring: Double-check that the spark plug wires are connected properly and in the correct firing order. Make sure the wires are firmly seated on the spark plugs and the distributor cap. Incorrect wiring or loose connections can cause misfires.
Spark Plug Gaps: Ensure that the spark plug gaps are set correctly according to the manufacturer's specifications. Incorrect spark plug gaps can affect the ignition process and cause engine misfires.
Distributor Cap and Rotor: Inspect the distributor cap and rotor for cracks, carbon buildup, or damage. A faulty distributor cap or rotor can disrupt the proper distribution of spark to the spark plugs.
Ignition Coil: Check the ignition coil to ensure it is functioning properly. A faulty ignition coil can result in weak or no spark, causing misfires.
Fuel Supply: Make sure the fuel is flowing properly to the engine. Check the fuel lines, fuel filter, and carburetor (if applicable) for any issues that might restrict fuel flow.
Fuel/Air Mixture: Verify that the fuel/air mixture is correct. A lean mixture (too much air, not enough fuel) or a rich mixture (too much fuel, not enough air) can cause engine misfires.
Compression: Perform a compression test to ensure that all cylinders have adequate compression. Low compression in one or more cylinders can result in misfires.
Timing: Check the ignition timing to ensure that it is set correctly. Incorrect timing can affect the engine's combustion process and cause misfires.
If you are unfamiliar with troubleshooting engine ignition issues, it is recommended to seek assistance from a qualified mechanic or refer to a repair manual specific to your vehicle.
