so my 96 2wd F150 5.0 throws either a excessive egr flow code or insuficient egr flow code periodically. lately it has been almost everyday i have to deal with this code. i just swapped the DPFE from a donor truck i have laying around and the light popped back on 30 miles later. im just not sure what it is. also tested the egr valve

 

Are the sample tubes intact and have you verified that there is vacuum present at the EGR valve at the appropriate times?

 

are u talking about the vacuum lines going to the DPFE and the EGR valve? and no i havent ran any tests except pulling a vacuum on the EGR valve at idle and it bogged down, making me think the EGR valve is fine

 

Comprehensive review of testing Ford DPFE & EGR systems is here: Part 1 -How to Test the Ford EGR Valve and DPFE Sensor