NFB: 4.3 isn't starting up

[Christopherrr]

In a nutshell, one of our company Express Vans has been sitting for about 5 months and was working fine (albeit not perfect). We bought a new Express to replace the old one because the mileage was piling up (127K).

So we decided to sell the old one and tried to start it up Saturday. Didn't start.

So this is what I did today:

Replaced fuel filter
Replaced Air Filter
Replaced Plugs and Wires (one hellish job before I figured I can go through the wheel wells. )
Changed oil and Filter

I can hear the fuel pump engage, so I don't think it's the fuel delivery. I'm leaning on ignition...could it be the ignition coils? Any insight on what I should check or do next?

[LS1 TA]

Maybe the fuel is just old. Try pulling a plug wire and cranking it to see if it is sparking.

[Christopherrr]

I thought that might be the case...old fuel. I should have check spark when I had the plugs out...I'll do that.