stalls while driving...egr code

[CRESECKER]

i have replaced the entire fuel system and ignition system in my 92 silverado 2500 5.7. i replaced all the sensors in it and the pcm and its still stalling sometimes and will idle a little rough sometimes....thinking its an intake issue due to buildup...and help would help me a lot...

 

[Chuzz]

Probably a stupid question, but have you tried removing and cleaning the EGR valve. Sounds like the pintle is either sticking or the diaphragm is shot.

 

[zora]

or check for a vacuum leak