I tried to take it to work this morning and toss my spare module at it before heading home but a quick CES flash after backing out of the driveway scared me back into my minivan. This evening thouygh, I tossed in my spare ignition module and MAP sensor (just for the hell of it) and so far so good, no sputtering or stalling. It took three weeks to act up last time though...
I was pleasantly surprised to find that the spare module for my Firebird (5.0L TPI) had the same three-digit number as the one in my 4.3L and will actually work in the big V6. At least I know this one is good.