With the weather now in the teens frequently, I decided it was time to re-visit the fuel settings on the GMC. With no intake heat on the tall single plane intake, I knew there would be no quick intake warmup for best fuel atomization. However, the engine still started perfectly in the cold, and warmed up very nicely in warm weather. One problem, in the low temperatures the cold engine would die and stumble after giving it some throttle and then quickly letting off the throttle in neutral - if you didn't allow it to warm up at idle first in these cold temperatures. I've pulled the idle A/F back to 14.0, and reduced the cold enrichment fuel six points - since richer idle A/F mixtures than around 14.4 - 14.6 have always left signs of gas fouling at the plugs at cold start in warm weather. I also reduced cranking fuel four points, but warm starts are still perfect in cold or warm temperatures. Problem two was I still was getting a spot of oil on the inner ceramic of some plugs at times after WOT. I determined this had nothing to do with my 14.7 cruise A/F or the lean idle A/F, and was not due to my timing. It also had nothing to do with the cylinders or heads. I adjusted WOT one tenth richer to 12.6 - and that problem seems to have disappeared. Accelr fuel has never needed any adjustment and still hasn't. So, I've left it alone. I'll have to see how the engine reacts to these changes over the next few days in cold starts. As far as driving, the truck still runs perfect.