My '94 Subaru Loyale will do DFCO down to ~2000 RPM depending on what the Idle Air Control (IAC) valve is doing. When I had the IAC unplugged, it would DFCO down to idle at 750rpm, which was awesome. Driveability was terrible though, so I put a restrictor plate on the IAC and plugged it back in. Now it can only bump the idle up to 1100, which is fine by me.
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