I'm gonna go with something in the wiring harness, just because it never showed symptoms of a tfi problem, and because it only started misbehaving after I lifted the engine. I don't have the will power to take apart my old harness anytime soon, but I have it in a bag in my closet. Someday I'll let my curiosity kick in, and I'll find exactly what went wrong.Interesting. I wonder what the problem actually was then - maybe a combination of factors.
Do a search for how to clean a catalytic convertor. A while back I saw some YouTube videos on the subject, but never tried it. If it worked, it would be cheaper that a new one. Here's one by Scotty Kilmer. Just a thought.Until then, I gotta save up for a new catalytic converter! Between the previous owner blowing coolant out the exhaust, and now me blowing untold amounts of unburned HC's through it, I can literally feel its restriction through the gas pedal!