2001 Chevy S-10 stalling, rough running, low idle

Engine Performance problem
2001 Chevy S-10 4 cyl Two Wheel Drive Automatic

Truck stalls, has extreme low idle, sometimes stalls as I am driving down the road. When thei happens sometimes it starts up first try, other times it takes 5 or 6 tries. Sometimes it runs as if it is starving for something, fuel, air whatever, like it's gasping for something.

I've replaced the fuel pump, fuel filter, the icm, the ect, the crank shaft sensor, the iac, and I've cleaned the throttle body. Nothing has helped.

What's causing this problem?