Super tuning car runs good shooting for great

14.9 is not bad at all IMHO.... .just as long as you are not looking for 13 at light cruise.... too much fuel for most engines. Other thoughts:

• Have you looked at the plugs after a drive to/from work to see if they show rich?
• Have you worked with adjusting the secondary stop screw? Like make sure the secondaries are on the stop screw and not resting on the bores? You'll have erratic idle when that happens.
• And maybe put a voltmeter on the coil + when warmed up and idling OK, and then see if it is the same when the idle goes rough. (Sorry, I have not gone through the thread to see what your ignition is so this may or may not apply.)
• Put on a vacuum gauge and monitor the vacuum to see if there is anything odd going on. It will drop when the idle drops, so determining cause or effect may not be easy, but you might catch some clues.

I'll apologize of this is all obvious to you.