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i would have expected it to be the plugs but since that doesn't seem to be the case it could be a vacuum leak. check hoses and intake manifold for leaks

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Q: How do i fix a diagnosis code P0304 a misfire in 4 in a 1996 Taurus with 3.0L compression good 120 changed plugs wires egr backpressure sensor vacuum solenoid vehicle speed sensor coil pack what else?
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