I have had 7 Astro's and or Safari's. If your ignition has some wear, like burnt cap and rotor, old coil wire, heat broken down ignition coil, you will have this symptom. I have been through this several times. My van is a work van and I carry a cap and rotor.
Here's what happens: These vans have such tremendously high ignition voltage, that the voltage is constantly looking for a path to ground and it will eventually find one. I replace my cap and rotor every year. I get the Autozone 5 year warranty and replace it every year (4 times for free).
If you have wear in the ignition system, this has happened twice to me. A cool night followed by a warm rain caused moisture to condense on the cap, rotor, and coil wire and it sparks to ground instead of to spark plugs. I one time had to pull the glovebox, dry the cap with paper towels and it ran and dried out. Another time, did the same and the old coil wire boots
were "permeated" with moisture even after drying with a paper towel. Stranded at a motel, and after drying the cap, rotor, and coil wire boots, I used the motel hair dryer to bake the boots dry and it started and ran well.
I found out that I can buy at Autozone just a single coil wire and I am careful to route it not near any grounded cross members or supports.
Behind the passenger front wheel is a shroud that in the middle folds straight up over the wheel A frame. If there is any problem with this shroud flap, your tire will spray your ignition coil with water because it is directly above.
I hope this was helpful.
Saturday, August 2nd, 2014 AT 1:34 PM