If it's not a giant vacuum leak, the other possibility is that the intakes are moving around and giving big MAF sensor misreads.
I'd carefully inspect everything along the intake tract for leaks (test by spraying carb cleaner -- if rev changes, you found your leak!).
Might also be worth inspecting the exhaust just before or just after primary O2's for leaks.
After that, see how secure the intakes themselves are. If you can easily move them around, try to bolt them down better.
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