Mine (E250 same year and motor) does that. I think it initially runs lean, perhaps because the automatic choke is sticky . Until it warms up a little won’t idle unless I pump the throttle even couple of seconds. After I drive it just a couple hundred yards it idles fine.My van will start, run for a few minutes then die. When I try to start it, it just cranks and doesn't seem to have any spark. Changed the coil, same thing happens. Any suggestions will be greatly appreciated.