gas or electric?

1990 4.3 z 215000
My van starts then dies.As soon as you hit the key it starts again the
dies. After four or five times it will idle roughly. When I pull out of the driveway it starts to pick up speed then boggs down. I can pepper the gas to get it to build up speed and once it is hot? it will usually run fairly well the rest of the day, atleast until it cools back down.
new fuel filter, plugs, wires, cap, button
I can't find any vacuum leaks, and the computer puts off no codes.
It's an old work van but it's been a good on so I'd like to fix it.Any help would really be appreciated.

Sounds like what my van did when I first got it running good after it had set for a couple years. But mine kept draining the juice out of the battery. I ended up getting a new alternator. Then it still did it. Had the new alternator checked and come to find out, it was bad as well. So I got a new one and put it on and the van runs like brand new. It's a 92 model.

That sounds like fun. Mine doesn't drain the battery yhough. thanks