well definitely post an update b/c my car is doing that crazy stuff right now and im only at 46k. i havent had my cel checked yet but i just started smelling something today that would lean me towards the o2 sensors going bad. i just did the fuel pump replacement to get away from the "bucking" but w/my luck on this car its still doing it. mine was only happening while the tank was about 1/2 or less but now it seems to do it whenever it wants and it actually cut off today while sitting in a parking lot just idling.