the distributer cap is located in the back of the engine and to get to is is relatively painless but you have to remove the engine cover on the inside of the vehicle which is under the dash in the middle of the vehicle which there is 2 big standard screws holding it to the firewall and 2 clamps holding the back side to the floor towards the seat. once you gain access to the engine compartment from the inside of the vehicle you will see the distributor cap right there looking at you. it is usually held on to the distributor by 2 small Phillips screws and will tell you first hand if the cap has not been changed in a while you might want to use a nut driver to break them loose and re-install in just reverse.
under the distributer cap
Access the engine from inside the van by removing the shroud it will be the first thing you see directly in the middle
In the distributor under the cap
Try replacing the distributor cap.
how to install distrutor cap and rotors in a 1998 chevy astror van
How do i change the window on a 95 chevy astro van
Right under the ignition cap.
how do I remove rear speaker in rear door 94 astro van rear door will not open
die
get an oil change
How do you change a heater core in 1994 chevy astro van?
I just replaced one on my 1992 astro and it was $120 just for the distributor not including the rotor and cap