my car HAD strange ideling problem about a week ago. ive read many posts and most people tell me that i should change PCV valve. so i did and guess what it idles like a baby now. i honestly dont knwo what the part does but when i went into AUTOZONE and told them " I need this part that makes your car idle smoother" and they were like possible PCV. so i got it it was like 3 bucks. and now its all good.hopefully this could help you
