Read this thread and check voltage on the FCA harness, that is where I found my issue after months of parts swapping.
P088 and P0251 - Competition Diesel.Com - Bringing The BEST Together
Also had similar issue with mine a year or so ago with rail pressure to high. I had bad fuel which was causing the fca stick open. After swapping pumps an 3 fca's later I finally realized bad fuel was causing it. But thanks to 06 Diesels thread It helped me find it.
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