The hose from the oil filler cap should go to the air filter. Clean air enters the crankcase from the filter. If you have it going to the inlet manifold the engine sees it as a massive air leak.
The nipple on the manifold with the restrictor should route across to the side ear just behind the fuel pump. That hose should have a one way valve just above the ear. In this cross pipe there usually is a T piece that runs a hose to your servo. Check all of the illustrations in the workshop manual, hand book or what ever you have. This is a common problem. You showed evidence of it in your first post when you mention clamping off the hose from the oil filler cap.
Go back to square one and correct your hose routing.
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