Need help

[Desperado]

I have a 2002 Ranger 4WD V6 4.0. SOHC. Truck started idling rough about 3 weeks ago. Got up this morning to go to work, cranked the truck and it started but it died within a few minutes. Started driving to work and when I came to a stop the truck would cut off. I have replaced the plugs, wires, fuel filter and MAF but truck starts idling rough after warming up. OBD11 code showed PO422. Sprayed carb cleaner all over intake and vacuum lines, no change in idle. No cracks or broken vacuum lines. Need truck running. This is my work truck

 

[Fane]

When my truck was having idle issues, it was sort of bumping back and forth with the RPMs going up and down and finally stalling. The cause was an EGR valve o-ring. Maybe check that on yours? Not sure if it's the same issue, but it's worth the suggestion.