First drive into work ended with 3 burnt plug wires.
Second drive ended with one burnt plug wire.
Today's drive? So far, so good.
I didn't do much, just replaced the wire that burnt yesterday with a similar wire, but routed it on the other side of the header brace. So now it's pressed up against the header flange instead of a header tube. Since the flange is bolted snugly to a temp controlled cylinder head, I'm guessing it will stay a lot cooler. I also took up the slack in the wire (with a zip tie near the coil) so the 90-degree ceramic boot on it couldn't droop down and lay the wire on the header tubes underneath. There's hot tubes on all sides, other than the block side there. Anyhow, good so far.
And I noticed a problem that's been causing some weirdness while driving. The TPS is a bit intermittent, sometimes reading correctly, sometimes reverting to a '-12.5%' setting. And when it does that, MS reverts to a fixed 10 degree timing. Which means the engine still runs, but it's... not peppy. I tried some basic multimeter tests, everything seems good on the MS side, so iffy TPS it is. I unplugged it until I can get a replacement. Now it reads about 30% all the time, and the ignition advance stays active. Which is a good thing.