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If spark plugs are replaced, what can most likely cause the misfire?

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Spark plugs have just been replaced and check engine came on showing codes P0301 - P0304
Vehicle: 1991 Acura Tl 3.5 liter

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HI there

You can still have issues with the ignition coil or the spark plug wires causing a misfire. Also, if the timing is off it can happen and vacuum leaks can cause it.

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