First did you reset the computer after replacing the EGR valve if you don't the computer doe'nt reconize the new sensor so it doe'nt reset the peremiters.Then check all passages and lines in the intake manifold there could be a clogg somewhere.Go to www.rockauto.com and you'll find EGR pressure sensor for under $30.00.
If you have scan tool, it can be reset easily
check the post here:
china diagnostic tools How to reset EGR value with OBD II scan tools
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