2000 Chevy Suburban 2000 Suburban will not idle or accelera

My 2000 Chevy Suburban with 5.3l engine died today, it had been running great now I can't get it to idle and pressing the gas does not increase the RPM's. No warning signs, went from normal to bad in an instant.

The truck has about 105K no check engine light.

After it stalls I have to wait a few minutes to start it again and it will immediately not hold idle.

With the key on I pressed the value on the fuel rail and got a squirt of fuel so it seems to be getting to the engine.

I've had the truck for about four year, purchased it with 60K. Normal maintenance has included regular oil changes and air filters. Fuel filter has not been replaced.

I don't think my truck has a distributor, the plug wires are very short and each connects to it's own module.

Plugs and wires are new, I changed them this afternoon after the incident occurred because I had them in the garage and figured it couldn't hurt. Made no difference.

I removed the snorkel from the air cleaner to the engine and observed the flap opening and closing with the throttle.

When I turn the key the engine will start but the idle is low, it will stay steady low for about 15 seconds then start to cycle lower until it eventually stalls. Pressing the gas or opening the throttle manually has little effect, it still stalls.

Help!