code P0304 misfire in cylinder 4

2001 NISSAN ALTIMA
152,000 MILES
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JPETERS1
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Hello i've got a 2001 Nissan Altima with how do i go about finding the problem and rectifying it? I've changed the intake gasket approximately 72K miles ago, don't know if that may help with this question.
May 24, 2012 at 12:43 AM
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SATURNTECH9
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Does it missfire more with the ac on if the ac works?
May 24, 2012 at 12:46 AM
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JPETERS1
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actually when the ac is on the vibration is less, but at idle and driving it is noticeable.
May 24, 2012 at 3:33 AM