I have a 87 4 runner that I smelled burnt oil while driving down the freeway. Popped the hood and the drivers side of the engine and hood was soaked in oil. Replaced the PVC to no avail. removed the oil cap, while at idle, place a piece of paper over the hole and it sucks the paper downward so the pvc seems to be working. upon reving the engine the dipstick blows up. It appears oil is blowing out the dipstck and out the oil cap whike driving. The plugs all look good. What would be causing this back pressure?? :