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Changed spark plugs now engine light is on and big loss of power?

There are a few possible reasons why your engine light is on and you are experiencing a big loss of power after changing your spark plugs. Here are a few things to check:

- Spark plug wires: Make sure that the spark plug wires are properly connected and that they are not damaged.

- Spark plugs: Make sure that the spark plugs are properly seated and that they are the correct type for your engine.

- Fuel filter: A clogged fuel filter can cause a loss of power and can also trigger the engine light.

- Air filter: A dirty air filter can also cause a loss of power.

- Oxygen sensor: A faulty oxygen sensor can also cause a loss of power and can trigger the engine light.

-Distributor cap and/or rotor. If your vehicle is older than 2010, it is possible that your spark plugs are connected to a distributor cap and rotor. Make sure that the distributor cap and rotor are properly seated and that they are not damaged.

If you are unable to find the source of the problem, it is best to take your vehicle to a mechanic for diagnosis and repair.

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