P0304 misfire cyl #4 2010 Buick Lacrosse 3 6

P0304 misfire cyl #4 2010 Buick Lacrosse 3 6

How to replace the coil.I have a P0301,P0302,P0303,P0304,P0305 or P0306 what should I do.The coil is the problem most of the time.

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305bonddog says:

Steve i have a 2011 Enclave Cxl just started giving me a P0304 code vehicle
has 70,000 miles would you advise i change all plugs at this time as well
as the #4 coil ?

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