my vx eats about a quart of oil every 1k miles but ive never changed the pcv it still rattles just fine - i clean it our every once in a while with carb cleaner - im pretty sure its the original from the factory - 115k miles

i wrestled with the idle problem for a while and after replacing the throttle posistion sensor and idle controm valve it ended up being the fuel pressure regulator - next on the list would have been the mass air flow sensor