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Remove the resonator box on the top of the engine. You must disconnect the intake air tube and the connection to the throttle body. After this is off it will reveal the coil packs (6) on top of the motor. Carefully remove the two bolts that hold the coil packs down. They are long and thin so a tap with a hammer on top is sometime a good loosening move. The pLugs should be good for 100,000 miles. Be sure that it is not a coil pack that has gone bad before wasting money on the plugs.
This not the relay, the problem is probably the blower motor resistor pack or the wiring connector for it. These are located near the blower motor behind and below the glovebox.
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.
Number one is closest to bumper then just count back they go in order 1-2-3-4-5-6 then the firing order is 1-5-3-6-2-4 also if your having a misfire check for lose wire and if I remember right those had a problem with water contaminating the coil packs check for white on the coil and on the boot inside and out, if they are chalky you need to replace the contaminated parts and the seal to keep water out at the back of motor where hood closes.
4.2 vortecs have individual coil packs located onthe vert top of the engine you have to remove the plastic intake thats sitson topand each individual coil pack to get at the plugs
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