I can't get the spark plug wire boots off the rear plugs on my 2004 Venture van, anyone have any tips on how to get them off?

There isn't much room back there......

There are two supports to the engine from the mounts on top of the radiator support....remove them....apply ebrake..... put car in neutral(not running)....then pull/rotate top of engine forward, and wedge a block of wood between the alternator and the firewall....that may give you a little more room.....popping off one of the wiper transmission lines from the wiper motor, gives you a little more room....you have to be able to grab that boot and twist it left and right to break it free, before pulling....not easy....some can be "baked" on pretty good....

I am able to get at the plug wires I just can't break the plug wires loose, any special tips on getting them loose

Get a pair of sparkplug boot pullers. They are designed to grip the boot and you can yank them off.

If your planning on replacing the wires I've actually used a hammer and prybar and broke the top of the spark plug off with the boot. AC plugs snap at the metal base. If it'* a Autolite the core is solid and the porcelain crumbles letting you pull the boot off. I only do this as a last resort if the wires just won't come loose!

It helps to twist the boot before pulling off the plug.

Getting your hand on the boot is half the battle.......you have to grip it good and twist left and right repeatedly.....if it doesn't break free, no amount of pulling is getting it off....

I too, have snapped the porcelain heads of the plugs off with a pry bar, mainly on the newer 3.8'* where it'* hard to get at them......not much room back there, on as van , to get a pry bar in there to snap those off.....hard to get a boot puller back there too....

In a shop, it'* easier to snap them from below while on a hoist....you can get a long bar up there and give them a good rap with a hammer....

But whenever snapping the tops off, be careful to blow any porcelain fragments away from the threads.....so nothing falls in the cylinder when removing the lower half of the plug....

But have a little patience.......grab that boot and work it back and forth, CW, CCW.....it will eventually break free and then you can pull it off....

Take a pair of channel lock pliers and twist the boot back and forth to brake the seal also works good to get radiator hoses off.