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Originally Posted by bkydmech
This is an add problem and I think it relates to the recent cold weather, the truck runs ok when its cold, but after about 20 minutes of running the #1 cyl is missing. I changed the plugs (NGK) and that helped slightly, but the #1 plug was a darker color before I changed out to the newer plugs so thats how I determined the problem is on that cylinder, above 3000 rpm it also runs great so I know there is nothing mechanical wrong with the cylinder, the 1500-2000 rpm range seems to be the problem range. any Ideas on where I can start? I also added some fuel injector cleaner and that seemed to slightly help.
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Try swapping #1 plug wire with a new one or with #2 or one of the same length and see if goes away or misses at a different cylinder.