K.. went back out this morning.. tried reducing the fuel pressure at the regulator.. dialed it back to 3 psi ... but it still crept up to 7 or 8 after idling for too long.. .a few blips of the throttle took care of it. no noticeable change in idle quality. I did the "hand over the front part of the carb" trick (not sealing my hand over the front openings, just restricting some of the airflow), and noticed a significant increase in idle.. probably an increase of 500 rpm. Vacuum leak. Sprayed carb cleaner around the perimeter of the intake manifold, no change.. however, spraying around the carb, I did notice some improvements. I'm gonna take it to the carb shop today for a rebuild.