I vote for plugs and wires, only because that was the problem with my old 93 SC, but I did have a similar problem with a 94 and it was because of a clogged fuel filter and bad pump.
At WOT, it's usually ignition related. More specifically if boost has been increased, it's blowing the spark out. Smaller gap or Denso iridium plugs is the fix.
i had a terrible buck at wide open throttle come to find out it was a variety of things, they were all bad at the same time and to this day I still don't understand how the car ran at all even though it did run like complete garbage.
1> sc belt tensioner shot (sc belt was slipping)
2> coil pack
3> harmonic balancer loose -stripped crank bolt (faulty crank signals)
4> exhaust leak
5> o2 out of range due to low current from air/fuel gauge
6> bad bap sensor
7> act sensor connector broken
8> bad ground from battery to chassis
9> pcv hose missing
>i had a terrible buck at wide open throttle come to find out it was a variety of things
And thanks for the detailed list
Note that those nine things on your list of repairs do not include 'plugs/wires'. Which was why this poll was put together in the first place.
Sure, P's & W's can cause all sorts of problems when they go south, and they may have been the #1 culprits 10+ years ago, but the majority vote here (and comments in the threads), was for them, while they haven't been found to cause issues related to the OP's problem.
Jumping onto the kneejerk P & W bandwagon simply ignores a host of likely & genuinely complex problems that these cars face more and more, as they get older and spend more time sitting and/or out on the road.
Hopefully the typical mindset surrounding troubleshooting of these cars will come to reflect an updated awareness, promoted by thoughtful owners that take the time to understand what is needed to keep them going strong.