Is the engine direct or port injected?
That was the issue when I grooved a Titan. And it had a weird PCV/breather system and intake tube with some sort of resonator chamber on it.
Howzabout some pics?
It is port injected. The pcv I routed through the catch can and down to the slipstream so the draft can vent it. So now the only functional vacuum lines after the throttle body is the brake booster and evap
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Re-learns can be helpful...hopefully that's the case here.
Catch can - are you finding quite a bit of oil in it, or is it mostly water?
I'm of the opinion that the water vapour it's getting rid of HELPS combustion, mileage, power and emissions. I removed the setup I had on my PCV re-route and gained an MPG or two back. The oil it collected was negligible to nil, and the water smelled of gasoline, but nothing separated out when I let it rest.