plug gap is too wide...gap to 28 then try again. if it still happens then try a known good dist w/o the msd items. if it still does it it's time to get a wideband on it to make sure you're not too lean/rich and datalog to see if anything else appears out of sorts.
go back to the checklist i posted earlier. feel free to call me if you want to discuss. 678-614-3596.