Just noticed this on a car I bought few weeks ago. Passenger side pcv outlet it connected to oil separator then to intake. Driver side has a breather on it. If I'm not mistaken, that would be unmetered air. So I was gonna eliminate the oil separator and hook both valve covers to a breather tank with filter. I unhooked the oil separator and blocked off Where it hooked up to the intake. Car wouldn't start. Tried pedaling it and couldn't keep it running. Hooked the oil separator back up thru the intake and starts and it runs like it did before I touched it. I'm assuming the previous tuner tuned around it and made it work. I've been having some idle issues ever since I bought it. Even when pressing in the clutch going down the road, the rpms drop really fast and almost always stalls if I don't shift it fast enough. I have to pedal the gas a little just so it doesn't. Other than that, the car is a beast. I'm getting it retuned on 0ct 9th by a different tuner. We'll see what happens.