These are the original plugs that came in the truck in 99 we have owned this truck since new. The other three plugs look great just a little redish color to them but all the electrodes were clean they were not black at all. One of them did have a little bit of oil on the threads but I think maybe just the valve cover leaked a little right there. Cause it doesn't smoke at all. As far as turning it the others came out with very little pressure to loosen when I went to loosen this one it just did not want to turn at all. Like I said earlier I didn't want to put too much pressure on it and muck it up. So i just left that one alone. I'll try again in the morning I'll hit with the PB Blaster tonight and try to get it out in the morning. It is supposed to be 30 tonight so it will be plenty cool in the morning!! LOL I did a few more searches for the idle problem and it seems maybe the MAF sensor wire maybe dirty or possibly water in the gas i filled up with the day after i ran it on the hill almost empty. This sound stupid but do any of you know where the MAF sensor is on this engine. I know on ford engines its right by the air box inline to the throttle body. There is an electrical connection to a little sensor(I'm guessing) right behind the air box on this one but its a very small nub of a thing in the intake hose. I am just all over the place with this, my wife blames me for running it on the hill almost empty so now i have to fix it!