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I believe the largest fitting of the fittings inline on the back side (facing the firewall) of the upper intake manifold is for the oil injectors?
If so, this fitting is sourced BEFORE the throttle body, which means it will NEVER see vacuum.
This explains why your brakes are not working properly.
The brake booster needs to source vacuum AFTER the throttle body.
I believe this fitting to be at least 10mm?
-Ted
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