So i have narrowed the behavior down (i think).
under manual mode @>3000 rpm with *NO LOAD* one cylinder is unable to burn all the fuel, and as long as there is no load or negative load (Decel hard foot off gas in gear 2) it continues the behavior until the spark plug wont fire
also important to note the AFR seems normal.
then i get the flashing cel with no code for the SCT, and i feel it misfiring on only 1 cylnder. after about 20 seconds of idle in park or tun engine off cylinder no longer wet all ok..
if you are accelerating moderately or hard it **seems to not occur** ... but i am deathly afraid to try to force the issue to occur under high load
my only conclusion is the sp542 plugs are still not good enough for me to run at .028 gap and or are too cold. will replace them later with one heat rang up, and close the gap **slightly** to .029
for now im going to drive it in normal drive mode for another 5000 miles and revisit the issue. the whole setup is under 3500 miles on a new engine,injectors,plugs so thee may be a wear in issue still working itself out.