I have a Pro-M 75mm and it works great. It comes with brand new electronics, too. A 77mm wouldn't make much a difference over your 76mm, though. You should find someone with a similar MAF sensor and swap to see if it really is part of the problem. You may also want to try swapping out your electronics.
I just bought a used stock MAF sensor for $25. If it works for me, great, if not, I'm gonna use it as a core to get a brand new one since I gave my old one away a long time ago. I wish someone just sold the sensing unit separately.
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