So I have a 1992 f150 xlt lariet 351w and it's been throwing codes 311 and 332 for over a year now. And I can't figure out for the life of me why it's still throwing code 332 I have replaced all vacuum lines, egr valve, the EGR DPFE, and the vacuum solenoid, but yet the code is still persisting. I originally assumed the 311 and 332 weren't connected, but now I'm starting to wonder if there is something connected to both system that I'm not thinking of.... I also checked the coffee can on my passenger side and it seems completely fine no rust or holes... If anyone can think of something else feel free to chime in.