99 Nubira stalling problem

I recently started running into a random stalling issue with my nubira... I can't "force recreation" of the issue so it's hard to track down. it will stall sometimes at red lights, and sometimes between shifts, and sometimes running down the freeway, steady pedal pressure for hours. I changed oil * filter, changed the aftermarket cone air filter, changed plugs and wires. other than the random stalling the car runs extremely well. vehicle has a hair over 90,000 miles on it, 5 speed 2 liter. anyone have any ideas? I attached my OBDEII tester to see if there was any fault codes and it shows clean. also replaced (6 months ago) the cam position sensor.