2000 ranger 3.0 egr problems

[ervinracing31]

i just had to replace my 3.0 flex fuel engine with a used 1999 3.0 flex fuel engine and ever since i started driving it again it misses and bucks under light throttle - then the check engine light came on - i checked the codes and got a egr insufficient flow code i have replace the egr valve the dpfe sensor the egr vacuum solinoid the vacuum harness and cleaned the egr pipe and intake port and still get the same problem - i checked the vacuum at the egr and it is not getting vacumm to egr no were in the rpm ranges- i at a loss thanks for any help