2001 Express dies when moving/Idles fine

2001 Chevy Express 5.0.
215,200 miles.
No codes stored.

Van ran great a year ago. It's been parked for about a year. Now it starts and idles fine for a while but as soon as you put it in gear and start moving dies sputtering. Then it won't start for hours. When starts again same thing happens. It cranks and you can hear the sound of the fuel pump every time you turn the key.

When it quites check for lose of spark to all plugs and fuel pressure.
Fuel pressure needs to be around 65lbs pressure for a cold start.
Get us know what you find.