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If you get desperate and need to diagnose without frustration:
I would unplug the maf and injectors,
remove all coil packs and use new ngk BKR7E(S) plugs, set then against ground so you can see all of them spark.
go engine tdc #1 and remove cas.
Now you can spin the cas by hand without cranking and flooding and diagnose the problem simply.
When you spin the cas, fuel pump should trigger for 3-4 seconds. That means there is 85% chance the cas working and connected properly with ecu.
It nearly rules out the cas -> ecu connection so you can focus on coils and igniter wiring to ecu.
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