I've had my bird kicking out an error code for a while, and I finally got to buying and replacing the 02 sensor in the left exhaust manifold. After finishing, it was much to my surprise to see my check engine light kick back on after startup. To get to the jist of it, my car is kicking out code # 159 MAF higher or lower than expected... possibly indicating a bad MAF sensor. Also, my car has a hesitation on accelerationg from a stop. I haven't been able to get it to do it regularly, but it seems to be doing it on a light acceleration, no hesitation when I floor it from a stop. Any suggestions?