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I experimented a lot with trying to get the engine to run lean for fuel economy, and reducing the idle speed.
For whatever reason the ECU isn't very smart about handling the throttle when you lift off at low rpm. If you tap the throttle quickly while it's idling it'll go up a bit, then almost stumble with the rpm going below 650, then it'll go up a little, then settle back down.
The lowest rpm the engine will idle at without stumbling when you hit the gas pedal is 600. 580 will stumble. At a 600rpm idle, it'll maybe stumble under heavy alternator load. As you raise the rpm from 600 to 700 the chance of it stumbling drops to 0, assuming you didn't make some other radical change.
Cam timing is always logged as 0 at idle. Doesn't matter what you change it to.
Off idle the response is really really bad though, it's possible that you're getting annoyed by something that only mildly bothers me. Raising idle to 700 should probably take care of it though.
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