some of those mofo dont tell you the truth they dig you for more and more money...lucky now i dont have emission but back in cali i had a da, went to do my emission and fail they said it was my cat so okay i came home and replaced it went back ohh now its the o2 sensor and then i was like fuk you...went to another guy and damn done deal lol...another quick story...my wife car idles and past emission idk either but it did...anywase gl with your bro