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why at random an 09 mercury mariner 3.0 engine during hard accerlation throws the po301 engine code at 30k miles

Vehicle: 09 mercury mariner 3.0

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Hi there,

This would commonly be caused by a faulty ignition coil on cylinder #1. When you are under hard acceleration it's putting the coil in it's failed condition. I would swap it with one of the cylinders next to it and see if the misfire moves with it. If it does, then you know the coil is faulty.

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