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Can you check EGR for sticking/leaks?
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you can use a syringe on the vacuum port to see if the diaphragm is bad. If you pull on the syringe and it doesn't get harder to pull, it's leaking. You should be able to pull it, and hold it with the same effort. If the effort gets lighter over time, it's leaking. It's best to have one of the larger syringes (60cc).
Hopefully you understand what I'm trying to say lol.
edit: With the syringe not hooked up to anything, put your finger on the tip and pull it.....thats what your looking for. the syringe plunger should want to go back in.