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Well I "solved" the problem of the high/loping idle by pulling the ECU's speed signal pin out of the plug. That way my EPS system stays happy and my speedometer/odometer work, the ECU just doesn't know the car is moving. Initially the only thing I noticed is that my Scangauge no longer showed my MPG, but then I noticed that I no longer get good engine braking when coasting in gear. I looked at the fuel trim and it doesn't look like the ECU is going into decel fuel cut anymore. I guess it won't if it doesn't see that the car is moving. It seems like trying to get the auto ECU to work properly with this swap is a losing battle.
After reading a bit, it looks like a high idle while coasting is normal for some manual transmission cars. Hopefully that isn't the case with these Civics, I really don't like it when the engine revs way up for no reason and lopes when I'm rolling in neutral.
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