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If the van was running before you changed the wires, I don't see how it is not firing the plugs now unless you got the wrong wires and they are not making contact with the coil towers and the plugs. If there is no spark on any of the wires, something happened to the coil pack or the crank/cam sensors. Or a fuse or relay for the coil pack. I would probably try an old plug wire to make sure, then check the coil for voltage.
Your shouldn't have any spark plug wires on your vehicle. There should be a coil on top of each spark plug. The firing order is 1 3 7 2 6 5 4 8 if that helps. I went back a year incase you had a late model 2000 but that 4.6 also has a coil on plug. If you do have spark plug wires, I don't think that's the original engine then.
first of all there should only be two wires for battery(+) & (-) the six wires if it's a six cyclinder engine, then it sounds like your holding the spark plug wires, which run from your spark plugs to the distributor cap and I have no idea the make or model/year etc so I can't tell you the proper order, if your lucky they'll be numbers on the cap and that will tell you what wire plugs into where there but to which spark plug I'm not sure.
change one spark wire at a time on the distributor.buy new set of spark plugs wires remove them from box.match old wires with new wires to use the correct length to each cylinder.now if you need to change distributor cap.mark location distributor cap.number tag plug wires on the distributor cap so you can remove plug wires on distributor cap so you can replace cap and rotor and put wires back on the distributor cap in correct place.remember change one plug wire at a time so you wont get confuse.
If your trying to change spark plugs remove one wire from a plug, replace that plug, reinstall the wire onto that plug and move on to the next plug. You don;t need to worry about firing order unless you plan on changing the wires or the cap and rotor. Even if you where to change the wires if you did them one at a time than the new ones would be in the exact same place as the old ones and there is nothing to worry about,
pull off plug grabbing it as close to spark plug as you can. Using socket rotate counterclockwise and remove plug. Be careful putting plugs back in and thread by hand first. Then torque as plug box says as it depends on if you have a washer or not.