Try reseting the computer. Disconnect battery for 10 min. If that doesn't work check for a bad plug, even though you changed them 1 could be bad or cracked?
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Possibly a plug wire or cracked distributor cap. I'd take a spray bottle and while it's running (be careful not to get your body parts in danger of the fan) spray some water on the cap area. If everything seems fine, you could spray down each plug wire at a time. See if you find the culprit that way. For a vehicle so old, if you haven't done a tune up lately. It's probably a good time. Replace the distributor cap and rotor. Plugs and wires.
What year? Does it have a distributor? If so, possible distributor cap/rotor issue. If coil over plug, you need to run a compression test to see if a cylinder is weak/valve issue
you need: spark plugs, spark plug wires, depending on if newer system that is all. if it is older you will also need rotor cap and rotor button. label the plug wires and change one plug and corosponding wire at a time after changing the (cap and button).make shure the plug wires go on the new cap in the same order that they came off.
When it comes time to change the plugs and wires and distributor cap do the cap and rotor first. Remove the old cap with the wires still attached. Put the new cap and rotor on the distributor and transfer the old wires one at a time. Make sure both caps are lined up in regards to mounting position on the distributor. The cap will only mount one way. When you have this done then you can do the plugs and new wires, again one at a time. This way, when you are done the van should start right up and purr like a kitten. Hope this helps.
Changeout the rotor button and cap. the cap has carbon pins under there and wear down from the rotor button. The rotor button sits on the distributor which is easily pulled off. When removing these be sure the plug wires stay in order, Also, use di-electic grease on the plug wires, prevents moisture getting there and run away sparks. CAP/ROTOR button $20 approx.
Try the pick-up coil that is under the distributer cap.Remove the cap and rotor button then remove the plate that is under the rotor button.Next you need to take off the relucter wheel that is in the way so you can take out the bolts and remove the pick-up coil.
do you have spark out of the coil into the cap? if so i would suggest removing the cap and testing for continuity between the center plug (coil input) and the spring loaded button on the inside also check the rotor, if you have no spark from coil at all be sure you have it wired correctly and be sure the coil wire did not get pulled apart in the ends please rate -jeff
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