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Most likely solution is to replace the s[ark plugs and check the ignition coils boots. The #4 cylinder plug has probably has a carbon track down the side of the porcelain part of the plug which will cause the cylinder to misfire.
Try moving the coil pack from cylinder 1 to another cylinder (swap locations) and see if the same code comes up. If code is different, then coil pack is bad. Other reasons for miss; bad injector, poor compression. Also, I know you changed plugs already, but always use AC Delco 43-103 plugs on this vehicle.
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