I am having the same issue, but I believe we narrowed it down to a bad MAF, When we installed my friends MAF, car runs great, but with my MAF, CRAP!
This is my second MAF, still looking for the right one.
Try switching MAF with a friend that has a car that is running good, see if his MAF does the same with your setup and see if your MAF runs like crap on his setup.
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