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If mice got into your trunk I would take a look at the wiring harnesses for mice chewing and then look at the vacuum hoses for deteriation. I don't think the spark plug wires are routed wrong [however they could be bad] as they are corroded in place. I think your problem is a bad Ignition Control Module and Coil Pack. Most of the time that is where the problem lies which is why I have 3 back ups that are prior tested and ready to go.

The wires being stuck on tightly is a good sign that they haven't been removed for a long time. Perhaps the plugs in the back weren't changed at all and they need to be. If you think the wires being crossed is causing the problem you could trace the wires back to the coil to verify without pulling off the spark plug wires. If you find that they are wired wrong you could just swap the wires on the coils to see if the engine runs better. I put new plugs in my car when I first got it about 13 years ago. To get more clearance in the rear I removed one bolt from the dog bone and pulled it up, then used a long pry bar to pull the engine forward and I held it in place with a tie down strap from my boat trailer. I still had to lay on a piece of cardboard on the engine but it gave me a little more room for my big hands to get the wires off and remove the plugs.

I went about 265,000 miles on the original timing chain in the Red, 190,000 on the Black and 130,000 on the 'vert [did the 'vert only because it is going to Brownville for the rest of my ownership of it and my mechanic buddy isn't coming along]. The Black that 2 seater got from me still has the original timing chain at 215,000 miles [the car has 100,000 more as it had an engine/tranny swap]. These are 300,000 mile motors before any engine work needs to be done. I think you are looking for a big problem when your issue is a much smaller one.