Welp, I finally got to test out my new spark plugs today...and well it did not take them long to get fouled. It threw a code for misfire on cylinder 2, then a code for misfire on cylinder 3 a minute later. So, my problem wasn’t just fouled plugs...the fouled plugs are a result of the problem! The car is lasting longer between misfires with the new plugs, but give it time, they’ll fail hard too.
At least in better news today, my parents finally got around to fixing the electrical gremlins in the Envoy XL...so at least I have a vehicle to drive indefinitely until Tucker is figured out/goes to the smartville in the sky.