JimS
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Thanks Jim, I purchased a smoke tester last week and of course the cone was too small for the maf inlet which resulted in an unsatisfactory bodge with a ploy bag and gaffa tape - but did get me as far as leaky throttle body seals - which are hopefully fixed. Looking for a better smoke cone adapter to continue the inlet testing.
I actually purchased a pair of coil packs so I could do some swapping with known good parts - but yielded nothing.
compression is good and consistent across all 8 cylinders
I will look at the wiring - that’s a helpful steer.
As background the Code only gets thrown under load
I am concerened though , hence the original post, that the ECU mapping is non-standard and would really like to put a standard map on as I can’t be sure what could have been mapped out.
A standard MAP would be good IMO, especially with the recent move to leaner running E10 fuel (presuming it was remapped with the good stuff)
Misfire under load sounds like a weak coilpack but you've eliminated that, weird. Maybe it is the wiring/connectors, they're old AMP/TE Junior-Timer connectors that have crimps that have a tendency to get a bit loose over time