Took it out again today. It's nice and warm, and dry, so the likelihood of moisture in the Optispark would be nil.
It ran OK at first, and started running increasingly like shit as it got hotter.
I removed the MAF connector, and restarted. Same shit...only, of course, now it threw a code for the MAF.
I reset the codes.
Did some reading on a Vette forum while the POS cooled.
According to what I read, it could be the ECM, the ICM, the Optispark, the MAF, the O2 sensor, or aliens from space...or a chafed harness, or bad connection.
I pulled every fucking connector I could find, inspected, and sprayed every contact with Deoxit D5 (best contact cleaner on the planet). It seemed to improve a bit, but is still throwing codes:
I'm at wit's end with this piece of crap. To read the Vette forum is to have nothing but pity for LT1 owners. GM owes a lot of people an apology.
This thing is pure fucking crap. I want a 68-72 with no fucking computer.
Anyone wanna trade?