I let a couple of drops of light oil drop behind the IAC piston/plunger, cleaned the EGR valve seat and cleaned the orifice at the top that goes through the drivers side of the TB. There is a metal cap about half way down the drivers side of the TB, that you can pry out and use a Torx to adjust minimum idle(after cleaning the passageway out). Minimum idle changes with the the motor temp. it's hard to get it just right at all temperatures. Keep track of where you started adjusting, in case things get too far off.
I did mine by trial and error, but a better method may be to let the IAC seat all the way, on a warm motor and adjust the minimum RPM with the Torx screw on the drivers side of the TB.
I also tried adjusting the throttle stop for minimum RPM, but every change of the throttle stop changes the TPS a little.
TPS adjustment, MAT and others also have an influence on idle. Mine changes from closed loop, to open loop pretty darned quick. It has been said it needs something like a 140 deg coolant temp. for the computer to switch to open loop, but mine changes way before that.
People have said the Renix has no memory, but after unhooking my battery, things change noticeably with mine. Who knows?
Try unhooking one of the vacuum lines on the front vacuum tree on the intake manifold, just to see what happens, if it helps, you probably need a little more air at start up. Unhook the vacuum line to the EGR valve and plug it for a test.
Old_Man recommended checking the values for the engine temp. sender on the lower left of the block and the MAT sensor, which I did. It's a good idea, just to know for sure.
Cleaning connectors and grounds has always helped mine to run better. All of the connectors on the lower left of the block, have a profound influence on how things idle and run and are rarley cleaned. I actually used a very small brush and a quality contact spray on mine.
I know the list is long, but there are a whole lot of inputs for the idle. Not to mention the state of your tune up.