What is wrong if your 1987 Voyager starts and idles but dies when you get on the gas and also has unburned fuel on the spark plugs?
There are a lot of things that could cause these symptoms. Foremost I think would be that you have a vacuum leak somewhere. SO check all the hoses, first and make sure that there aren't any laying about unplugged. Secondly, you might think about replacing them anyway due to the age of the van. Rubber hoses only stay rubbery for so long and this could be the cause of the leak. If you can rule out a vacuum leak then I would suggest retrieving the codes, if there are any, stored in the computer. http://www.allpar.com/fix/80s-codes.html If that doesn't point you in a specific direction, then you may want to take it to the shop and have them run their diagnostic on it, which is more detailed than the onboard diagnostic.