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Sorry, I haven't closely read all of the messages in this thread. What jumps out at me: sequential injection, and 50% of the time it runs well. Are you using a crank trigger or cam trigger for injection timing? If crank, there is a 50/50 chance your injection timing is using tdc versus bdc to start the timing sequence. A very noticeable effect in my old megasquirt days. Spraying while air is rushing past the intake valve versus 180 degrees out and the fuel ends up wetting the cylinder walls. Same injection times, different afr's. Something to think about. Good luck!
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