97 5.4 260,xxx. Pulling lean codes for both banks and a p0401 EGR flow. Truck is idling like crap and stalling when I slow down or stop. (Occasionally) new fuel filter, new fuel pump, new air filter, new maf sensor, new o2 sensors. Can’t find a vacuum leak anywhere, sprayed entire engine in carb starter and had no effect. Need help

edit: engine does smooth out when I give it some gas.

 

I would suggest that you remove and check the EGR valve for being full of carbon and staying open. Sometimes a few raps on the exhaust end with a MALLOT ,will dislodge the piece of carbon and allow the pintle to seat and close fully.. Get a new gasket before removing the valve , you might need to replace it.