WHAT IS THE CORRESPONDING ORDER OF SPARK PLUGS TO

If the coil pack has a four wire connector, one wire is primary voltage, the other three wires are ground, one ground for each coil, one coil fires two spark plugs. If problem with coil or ground, you would lose spark for two spark plugs. Did you visually check for spark, everywhere? What about the spark plug wire or the spark plug, itself?

It sounds like the spark plug wires are not plugged into the correct place on the distrubutor. take the distributor cap off and crank the engine over. Make a note of which direction the rotor spins. (Clockwise, or Counterclockwise) then find the firing order for that engine. Sometimes the firing order is on the intake manifold. (if you tell me which engine it has, the 4 cylinder 2.0, or the 6 cylinder 2.5; I could post you the firing order). Now on the distributor cap there is one wire post that has the #1 on it, that would be where you put the spark plug wire from cylinder 1. Following the rotation of the distributor rotor, you would put the spark plug wire for the next cylinder in the firing order after the #1 wire, and so on.

There are 2 different V6 engines used in this year of Van, a 3.3 liter and a 3.8 liter. The diagram and firing order is the same for both engines. Below is the diagram from the service manual and the firing order.

You may have got the spark plug wires out of sequence.
Reseat the coil wire going to the center of the distributor cap Check the spark plug wires at the distributor against the firing order as follows:
The spark plug firing order is 1 - 4 - 2 - 5 - 3 - 6 The distributor rotor turns CLOCKWISE The engine cylinders / spark plugs are numbered :
firewall 3 - 6 2 - 5 1 - 4 front
Best wishes,
TF

i would check the order the leads go from the distributor to the spark plugs as 1 or 2 of these might be incorrectly placed on the wrong spark plugs causing the mis-firing.

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go to link, 2004 is the same.

http://autorepair.about.com/library/firing_orders/bl-fo-0114.htm

Copy and paste this link into your browser. Firing order is 123456

http://autorepair.about.com/library/firing_orders/bl-fo-5203.htm

Because you didn't say which engine this link will take you to a proper site that has what you need