That it was.
Well runing Denso Iridium spark plugs (IKH20). No more cold engine accerlation problems. Truck started acting like is was getting flooded with gas near the 40k mile mark.
Old plugs just some light carbon build up. Gap was .050 to .054 on the 4 old plugs I checked.
The denso all gapped within .040 to .042 (5 .040, 1 .042). Plugs should be good for a long time if this iridium material is all that and a bag of chips.