You told them dual pop, dummy MAF? Not dual pop Selin? Dual pop/dummy means you would have it set up like you mention (average the two) Dual pop/selin means you need to have it set to add. If you do have the dummy MAF programmed chip, and using either DS or PS doesnt work, I would suspect a bad connection or two bad MAFs (more likely wiring). How is your EFI harness? Either way, you should have the selin add setup to take better advantage of that setup (a little better resolution)
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