1988 Astro Van

4.3 v-6 Stalls in gear, rough idle, loss of power. I put in a "fuel meter body gasket kit" Now it wont start. It is getting plenty of fuel. Any sugestions. I'm lost, please help.

How do you know it's getting fuel? Are you seeing the injectors fire when trying to start it?

Yes I have it all torn down. It is getting plenty of fuel.

ok, plenty of fuel, which seems to rule out fuel pump, pulsator, pressure regulator, or injectors.
So next guess is no spark, Ignition coil perhaps.
when your turn the key how does it crank?
I'm not necessarily thinking battery here, but the postive negative cables off the battery.