[cotbu]

Their installation guide should tell you what timing to set, usually stock!
As far as idle, In the text books it says to set the idle rpm to the lowest stable idle you can achieve.?!? If i followed that rule I could idle at 650rpm, but I always set Sr20's to idle at 850rpm. (I like the sound.)
I seen 1000pm to 1200rpm idles though, I never understood why. In your case, I would go over all vacuum lines and vacuum dependent equipment and make sure you have no leaks, check all sensors, then get tuned.