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It's still misfiring. The engine is running to fast for the computer to pick it up. Pull the plug wire on 6 , start the truck. look for spark out of the wire. No spark, replace the coil pack. Spark, pull the plug,see if it is fouled out. I would do a compression test also, while the plug is out.
Need to know what kind of vehicle and size motor but normally they are located on the top or side of the motor witha spark plug wire running to each cylinder, these wires will have a rubber texture and be about a quarter in in diameter.
make sure you have the correct plug wires going to the correct cylinders. sounds simple enough but my friend made the same mistake on his 98 tahoe and he's been a professional mechanic for 15 yrs
If it skips just sometimes, then it could be the spark plug wires, if you change the plugs then its good to change the wires. Also take a timing light and connect to each of the wires one at a time, and rev the engine. Watch to see if the light skips. (an irregular flash) If so then trace the wire to the coil pack and replace the pack. Also anytime you replace spark plugs replace the fuel filter, air filter, and pvc valves.
you may have a bad coil---take a pair of rubber handle plyers & remove the spark plug wires 1 at a time---when you pull off a plug wire you should notic the truck runs even worse---the one you pull off & it doesnt change the way it runs--that is the cylinder that has the problem
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