[Ed Wright]

Art, I would warm it up, then pull the plugs. They should be pretty much white. If they are black, you found it. If you can slip a muffler on it, or an extension about two feet long, you can idle it & drive it up and down the return road to find where it is so rich. Try to make it run 14-1 to 14.7-1 air/fuel at idle and all part throttle areas of the map. You can get a look at the decelloration a/f if you leave the logger on as you slow down. I think your probably cleaning the plugs up on the first pass. I'm surprised at how many black spark plugs I see guys pull out after warming them up. I hear over- rich cars driving around the pits all the time. Maybe they are trying to tune that part with open collectors?