My 02 gp gt has DELPHI oem spark plug wires. Are these wires stock? How hard are the rear plugs to get to? Can I remove the alternator to make it easier? Do I need to remove the o2 sensor? The car has 198k miles.

I am currently having a sporadic long crank no start condition but it's happened maybe twice in 7 months. So I'm just going to do basic tune up. I replaced the FPR today so we'll see about that too.